Insulator Companies

 

List Includes U. S. and Foreign Companies

and Company Catalogs in the Files of the

Insulator Research Service

The original company listing was quickly put together as a searching guide for a research trip to the Smithsonian Natural History Museum catalog archives in August 2006.  A special thanks to Caleb Thimell for supplying his list of foreign insulator companies and to Rick Soller for his input and company listing on his web site.  Recent resources for additions to the list and historic details came from the links shown below with a few individual contributions, most notable being Jean-Pierre Volatron.  A special thank you to Bill Meier for dramatically improving the table formating and file size.  With Bill's help, this simple list will eventually be expanded to include company histories.  Stay tuned...

Thank you, Jean-Pierre Volatron, for correcting and updating the listing for French companies (12-27-06).

 

 

For additional historic information, try these links:

For a list of insulator CATALOGS in the IRS files, click on the link.

For a complete database of nearly 3,000 insulator related patents including more than 300 lightning rod related patents click on this link: Patents

The following are abbreviations to help identify at a glance the basic nature of each item in the list.

USP - U. S. manufacturers of porcelain insulators (pin-type, standard porcelain, tubes, suspension, etc.)

USG - U. S. manufacturers of glass insulators (pin-type, lightning rod, suspension, etc.)

USO - U.S. manufacturers other electric insulators (rubber, plastic, Electrose, Bakelite, Lava, etc.)

FP - Foreign manufacturers of porcelain insulators

FG - Foreign manufacturers of glass insulators

Pot - Pottery (non-insulator)

Sup - Supplier of insulators and electrical supplies

M - Miscellaneous (patentee name, utility company name, etc.)

HELP!!  Please help me make the company listing as accurate as possible.  Use the email link on the Home page to offer corrections, additions, comments, etc.  This list is a work in progress.  All help is welcome!

(updated April 24, 2008)

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Company Type Name Insulator Markings Dates of Operation Location Comments
USP A. B. Chance Co. PP; PP Co. 1956-1963 Carey, OH Manufacturer of dry pressed porcelain; purchased from Porcelain Products, Inc.; renamed in 1959 as Porcelain Products Co. but still owned by Chance which sold the plant in 1963 to Clarken Co. of St. Louis (still operated as PPCo.). The plant was sold in June 1963 to Clarken Co.
USP A. B. Chance Co. CHANCE 1956-198? Parkersburg, WV Manufacturer of wet process porcelain. Purchased from Porcelain Products, Inc.; CHANCE marking started 1959 
USP A. E. Co. Inc. [see Automatic Electric Co.] A. E. Co. Inc.      
Sup A. J. Wilkinson & Co.     Boston, MA  Electrical supplies
USP Acme Porcelain Works   1900-?? Trenton, NJ The plant started in June 1900 by Noah W. Boch. The company manufactured electrical porcelain specialties. He also operated at the time American Porcelain Works at Berryville, NJ.
USP Adamant Porcelain Co. HOLD FAST 1907-1929 East Liverpool, OH According to Jack Tod's Electrical Porcelain book, the Adamant Porcelain Co. was organized in 1907 by J. C. McQuilken, W. J. Curry, W. A. and T. J. Andrews to make electrical porcelain. The plant was closed in 1913. The defunct company was purchased by Harry Peach and George Reid in 1915 and name was changed to T. V. Milligan Porcelain Co. and product sold under the "Adamant" name. However, the Adamant Porcelain Co. was listed as a new incorporation in The Mansfield News on May 8, 1915 (see article 7298) with George H. Reid as owner. The plant was destroyed by fire on February 7, 1918.
FP Agarwal Salt Co.   modern Bikaner, India Manufacturer of porcelain insulators
FP AGROB Corp. TREVERIS   Munich, Germany  
Sup Ajax Electric Co. AJAX   Jersey City, NJ Electrical supplies, grounding and wiring devices
Sup Ajax Electric Specialty Co. AJAX   St. Louis, MO Electrical supplies, radio and wiring devices
USP Akron High-Potential Porcelain Co. H. P. CO. 1906-1910 Akron, OH  
USP Akron Insulator & Marble Co. A. I. & M. CO. 1895-1902 Akron, OH  Manufacturer of pottery knobs, tubes, cleats
USP Akron Marble Co. A. M. C. 1893-1894 Akron, OH  Manufacturer of pottery knobs, tubes, cleats
Pot Akron Marble & Novelty Co.   1893- Akron, OH Might be predecessor to Akron Marble Co. or Akron Insulator & Marble Co.
USP Akron Marble & Toy Mfg. Co.   1891-1904 Akron, OH The plant was located at State and Center streets on the canal. It was started in 1891 by Sam Dyke, A. L. Dyke, and other local Akron businessmen. This company was the largest toy manufacturer in the United States during the 1890's. Almost every type of marble known to exist was made at this factory including hand gathered glass marbles, glass marbles cut from canes, stoneware marbles, china marbles, plain clay, low-fire, porcelain, glazed, painted, etc. The plant was destroyed by fire in 1904. Today the factory site is covered by a beautiful park which also includes the American Marble and Toy Museum.
USP Akron Porcelain & Plastics Co.   1984-present  Akron, OH Successor to Akron Porcelain Co. Manufacturer of specialty porcelain
USP Akron Porcelain Co.   1928-1984  Akron, OH New plant built on 400 feet of railroad frontage in Kenmore, OH (now Akron) on the Akron-Barberton Belt Line Railroad and the company name was changed from Mogadore Insulator Co. 
USP Akron Smoking Pipe Co. A. S. P. CO. 1890-1920 Akron, OH  Manufacture of pottery knobs, tubes, cleats by 1895.  Name changed to Mogadore Insulator Co.
FP Aktiengesellschaft Brown Boveri & Cie     Baden, Switzerland  
Sup Albert & J. M. Anderson Mfg. Co.     Boston, MA Supplier of trolley line equipment, composition insulators (Aetna Insulators), wooden strain insulators
FP Alberts & Kluft AKA   Tilburg, Netherlands  
Sup Alexander, Barney & Chapin, Inc.     New York, NY Electrical supplies, porcelain cleats and spools (marked U.P.W.), Victor Split Insulator (marked "The E. S. Greeley & Co., NY), glass insulators - CD 133, 126, 134, 162 and 145, floor insulators, Brown's screw glass insulator, oil insulator, tree insulators, etc.
  Algoma Eastern Railway AER   Canada White porcelain insulators with under-glaze ink marking AER were used on this railroad line.
FP Allied Insulators Industrial Products Ltd.   1959-?? England  
  Allied Porcelain        
Sup American Automatic Electric Sales Co.     Chicago, IL Telephone supplies, Hemingray, Whitall Tatum
Sup American Electric Co., Inc. AMERICAN ELEC CO INC   Chicago, IL Telephone supplies; they sold U-188 dry-spot insulators made by Square D from 1925 to 1929 (see Automatic Electric Co.)
USP American Electric Porcelain Co.   1910's East Liverpool, OH Operated a number of plants in East Liverpool. In 1913, these plants were shut down and operations moved to a new 21-kiln plant in Parkersburg, WV.
USO American Hard Rubber Co.   1898-1930's College Point (New York City), NY The original company was founded in 1854 by Conrad Poppenhusen to make flasks, cups, and buttons using vulcanization process for hardening rubber patented by Charles Goodyear. In 1898 several rubber companies were merged to form the Amerian Hard Rubber Co. The company moved to Butler, NJ in the 1930's and soon closed due to competition from plastics. Known antenna insulators are of the small strain type, "Radion Brand". The reddish brown rubber has a metal eye-loop on each end.
USG American Insulator Co.   c. 1883-1886 Boston area, MA Samuel Oakman 
USO American Insulator Co. AICO; AMERINE 1916-1920's New York, NY John Wesley Hyatt invented Celluloid in 1866. At the turn of the century (c. 1900) Emile Hemming developed cold molding and founded the American Insulator Co. in 1916. Baekland invented the first truly synthetic plastic in 1909 called "Bakelite". By 1927 the company name was American Insulator Corp. with headquarters listed as 52 Vanderbilt Ave., NYC. The cold molding plant was in New Freedom, PA and the Bakelite plant was in Danbury, CT. Manufactured sockets, bushings, receptacles, connectors, casings, table outlets, etc.
USG American Iron Glass Pipe & Plate Co.   1884-1885? Haverhill, MA Company was organized on March 31, 1884 and started production in mid-December 1884. It was referred to as the "Iron Glass Works" and the "Iron Glass Co.". Produced insulators (CD 110.5 and CD 110.6) for the National Insulator Co.
Sup American Jobbers Supply Co.        
USO American Lava Corp.     Chatanooga, TN Address was 1419 William St. (see Steward (D. M.) Mfg. Co.)
USP American Marble & Toy Co. AM; AMC 1891-1904  Akron, OH Standard porcelain began probably in mid-1890's; markings on insulators were AM and AMC; plant destroyed by fire in 1904
USP American Porcelain Co. AMERICAN; AP in a circle 1914-1932  East Liverpool, OH Probably made U-98 Cooke Wilson E.S.Co. insulator 
USP American Porcelain Works   late 1890's-?? Berryville (Trenton), NJ Owned by Noah W. Boch. In 1898, products were specialties, knobs and electrical goods and jardinières.
USP American Potteries Co.       Trust of 18 potteries in Ohio, West Virginia, and western Pennsylvania allegedly incorporated in December 1898 in New Jersey. (see article ). Bell Pottery Co. of Findlay, OH filed suit against the trust in January 1899. Options on acquiring or combining the 18 potteries into one company expired in February 1906 as the third and final attempt to form a trust failed. A similar trust or combining of companies was finally accomplished in 1911 with the formation of the General Porcelain Co.
Sup American Sundries Co. AMERICAN SUNDRIES CO.   Brooklyn, NY Electrical supplies
M American Telephone and Telegraph Co.        
  Anchor Electric Co.        
FP Anciens Etablissements Parvillee Freres & Cie (Former Establishment Parvillee Brothers & Co.)   1899-1949 Cramoisy near Paris, France See Parvillee
USP Anderson (Electric) Porcelain Co. A. P. Co. 1903-1911  East Liverpool, OH Merged into General Porcelain Co.
Sup Andrae (Julius) & Sons Co. [see Julius Andrae & Sons Co.]        
USP Anglo-American Potteries     ?? Company was organized about June 1903 to build five potteries in the western U. S. One was suppose to make electrical porcelain.
Sup Anylite Electric Co. ANYLITE   Ft. Wayne, IN Electric sockets
Sup Appleton Electric Co. APPLETON ELECTRIC CO.   Chicago, IL Electrical supplies, outlet bushings
FP Arabia Porcelain Company     Helsinki, Finland  
FP Arendelovac     Serbia  
FP Argillon   2003-present Redwitz, Bavaria, Germany History tied to Siemens when Siemens acquires ceramics plant Neuhaus-Schierschnitz. Insulator plant at Redwitz was started in 1950. In 1998, Siemens Fabyka Izolatorow SP. Z. o.o., Jedlina Zdroj started production of medium and low voltage insulators in Poland. Since September 2002, Argillon has belonged to the American Private Equity Firm KKR (Kohlberg Kravis Roberts & CO.). KKR is one of the worldwide leading capital investment companies that was founded in New York in 1976.
USG Armstrong Cork Co. Armstrong 1938-1969 Millville, NJ  
USP Artistic Porcelain Co.   1890's - 1906 Trenton, NJ In 1898, products were specialties, knobs and electrical goods. Located at Cedar Land and Chambers street. Noah W. Boch was the manager of the company and owner, but did not hold stock in it. He filed for bankruptcy in January 1906.
FP Art Potteries Private Limited   modern Kolkata, India Manufacturer of porcelain insulators
USP Austin (A. O.) Insulator Co.   1933-1969 Barberton, OH A. O. Austin left Ohio Brass and started the company. After he died in 1969, the company was purchased by British company Decca, Ltd. and plant was moved to near Toronto.
FP Austin Insulators Inc.   1969-present Mississauga, Ontario The company was owned by Decca, Ltd., Racal-Decca (1980), and then Litton Marine. In the year 2000, the company, the employees purchased the company. Manufacturer of tower base insulators, guy strains, feed-through bushings & RF insulators.
FG Australian Consolidated Industries A.C.I. c. 1950-?? Sydney, Australia In the 1940's, several other smaller glass companies were merged into C.C.G. and name was changed around 1950 to Australian Consolidated Industries.
FG Australian Glass Manufacturers' Co. A.G.M.; AGEE ??-c. 1950 Sydney, Australia In early 1926, the C. C. G. was formed by a merger of Crown Glass, Ltd. with the Australian Glass Manufacturers' Co., which owned a majority of the shares. C.C.G. merged with Australian Glass Manufacturers in 1942. In the 1940's, several other smaller glass companies were merged into C.C.G. and name was changed around 1950 to Australian Consolidated Industries. AGEE is pronounced "A. G."
FP Australian Porcelain Co.        
FP Australian Porcelain Insulators Pty.   ??-1956   API
Sup Auth Electrical Specialty Co.     New York, NY Electrical supplies, batteries, and battery rests
Sup Automatic Electric Co. A. E. Co. Inc. 1890's-present?  Chicago, IL  The Automatic Electric Co. was founded in the 1890's by Almon Strowger after he received a patent on March 11, 1891 (447,918) for the first automatic telephone exchange, which allowed dialing a phone number. He was an undertaker in Kansas City undertaker who suspected telephone operators were diverting incoming calls to his competitors. Strowger developed an automated switchboard that could bypass human operators. The company later sold telephone supplies which included the U-188 made by Square D in Peru, IN from 1929 to 1951.
USG Babson Bros. Co. SURGE ??-1999 Chicago, IL Surge electric fence, CD 100 and CD 100.2. Company was purchased by the German company, Westfalia Landtechnik GmbH and renamed the company Westfalia-Surge, Inc.
FP Bailey & Co.   1880's London, England Fulham Pottery
Sup Baltimore Electrical Supply Co.      Balitmore, MD Electrical supplies
USG Baltimore Glass Mfg. Co.   1895-1897 Baltimore, MD B.G.M.CO.
Pot Barberton Pottery Co.   1902-1905 Barberton, OH Creditor's suit forced bankruptcy; restarted 1906 as Akron H-P Porcelain Co.
  Bay Ridge Specialty Shop        
USG Bay State Glass Works   1878-1879 East Cambridge, MA Samuel Oakman
USG Beaver Falls Glass Co. B. F. G. CO. 1869-1879 Beaver Falls, PA  
Sup Belknap Hardware & Mfg. Co.     Louisville, KY Lineman's supplies, insulators, radio strains, lightning arresters
Pot Bell Pottery Co.   c. 1890-1906 Findlay, OH The pottery had been in successful operation for many years. In 1899, it filed suit against the consolidation of 18 potteries in Ohio, West Virginia, and Pennsylvania into a trust called the American Potteries Co. Formation of the trust failed in 1906. Bell Pottery filed for bankruptcy in 1905 and in 1906 the defunct plant was sold to a new company, U. S. Electric Porcelain Co.
USP Bellevue Porcelain Works     Boston, MA 131 State St. except ads in 1901-02 state 45 Arch St. Maker of the "A. W." cleat.
Sup Bendix Aviation Corp.     Baltimore, MD Aviation radio equipment, antenna insulator
M Bennett (A. R.)   late 1800's England British patent
USP Bennington Potteries (U. S. Pottery Co.?)   1849-1858 Bennington, VT The Bennington pottery was started in 1851. It exhibited pottery and insulators at the 1853 at the Crystal Palace [Barber, Fig. 74]. They produced the following insulators: U-978, U-979, U-980, U-981, U-982, U-983
USP Bergman Electric Co.   1880's-1890's New York, NY Bergman first made receptacles and cutout from wood under Edison patents and began investigating porcelain as a replacement for wooden insulation. In 1885, Bergman together with John J. Kraus from the Artistic Pottery at E. 18th St. in New York, started experimenting with dry pressed porcelain. The first product was made in 1888 with Bergman Electric taking the entire production. Bergman was later taken over by Edison Machine Co., which later became General Electric Co.
  Bernard Co.        
FP Bharat Heavy Electricals Limited, Bangalore   modern Bangalore, India Manufacturer of porcelain insulators
FP Bing & Grondahl   1918-1941 Copenhagen, Denmark  
  Birmingham Glass Mfg. Co.   1923-?? Chicago, IL Address was listed as 29 S. LaSalle St. founded by Harry C. Brown Bryson, E. R. Owens, Richard T. Robb, Geo. A. Peterson and Glen E. McDorman.
Sup Birnbach Radio Co., Inc.     New York, NY Radio and antenna supplies
USP Boch (John) Porcelain Co.   1907-1919 Newell, WV Plant was started by John W. Boch, Sr. after he left R. Thomas & Sons Co. in 1907. The company was located at the northwest corner of 3rd and Harrison streets and made electrical porcelain. He became associated with Cassius M. Metsch and changed name to Boch-Metsch Porcelain Co. in 1919.
USP Boch-Metsch Porcelain Co.   1919-1922 Newell, WV See Boch (John) Porcelain Co. John W. Boch, Sr. left in 1922 and name was changed to Metsch Refractories Co. They manufactured electrical and heating porcelain.
FP Bonle (Fuzhou) International Co., Ltd.   1998 Fuzhou City, China Operates five factories for various small electrical goods such as switches, plugs, extension cords, porcelain pin-types insulators, suspensions and other porcelain styles, glass suspensions, and composition styles.
FG Borgo BORGO 1921-July 1928 Borgo, Italy Italian glass factory owned by French company Folembray (Verreries de). Name was changed to Fidenza in July 1928.
USG Boston & Sandwich Glass Co.   1825-1888 Sandwich, MA Lightning rod insulators
USG Boston Bottle Works   1872-1877 Boston, MA Samuel Oakman 
Sup Bouchery (G.) & Cie (G. Bouchery & Company)   1897-1912 Paris, France See mini-gingerbread man: http://www.insulators.info/pictures/?id=182147954
FP Bourne, Joseph & Son   1850's-1880's or longer near Derby, England Denby Pottery. Manufactured various porcelain/pottery insulators such as Varleys "V" and "Z" pattern and the Fullers patent (U-1991-1992 series) corrugated inverted cone.
Sup Brach, (L. S.) Mfg. Co. [see L. S. Brach Mfg. Co.]        
USO Brady Electric & Mfg. Co.   1920's New Britain, CT Manufacturer of tree insulators.
Sup Brewer-Titchner Corp.       Insulator hardware maker
USP Brian Pottery Co., Inc.   1898-1908 Trenton, NJ Located at 350 Hamilton Ave. near the Interstate Fairgrounds. In 1899, their ad stated "Manufacturers of Porcelain Baths, Wash Trays, Sinks, etc. High Grade Vitrified Porcelain for Electrical Purposes. New and Difficult Designs a Specialty."
  Bright's patent insulator (CD 630 and CD 631) BRIGHT'S INSULATOR // REID 1858   England See foreign patent (Great Britain) 2601 granted 1858 to Charles Tilton Bright. His invention of the "double-cup insulator" included a larger skirt fitted down on the upper portion to cover the insulator below the cable groove on top.
USG Brilliant Glass Products Co.   1920's-1926 Brilliant, OH The plant was moved to Weston, WV
USG Brilliant Glass Products Co.   1927-?? Edmiston (near Weston), WV Plant was moved to Edmiston which was on the Weston-Clarksburg interurban line near Weston, WV. Operations started on October 20, 1927. Products were lenses, automobile headlights, signal glass, radio accessories (antenna insulators), and novelties.
Sup British Insulated Callender's Cables Ltd.     England Mine, trolley, tram, and electrical supplies
FP British Insulators and Helsby Cables     London, England Porcelain; formerly Telegraph Mfg. Co.
Sup British Johns-Manville Co., Ltd.   early 1900's London, England Electrical supplies, molded black composition and mica insulators, Thomas glazewelds and multipart (cemented) insulators
USG Brookfield Glass Co.   1864-c. 1906 Old Bridge, NY  
USG Brookfield Glass Co.   c. 1906-1921 Brooklyn, NY  
Sup Brooklyn Wireless and Electrical Novelty Co.     Brooklyn, NY Radio supplies, Electrose antenna strain insulators
  Brooks (David)     Philadelphia, PA Patented metal incased glass cup and rams horn
USP Brown Boveri & Co. BBC 1980-? ? Victor, NY  
USP Brunt & Thompson B & T 1895-1897 East Liverpool, OH Electrical porcelain. Successors of the Henry Brunt & Son Co.
USP Brunt (G. F.) Porcelain Co. BRUNT, CINCH 1897-1907 East Liverpool, OH Brunt bought out Thompson from Brunt & Thompson
USP Brunt (G. F.) Porcelain Co. BRUNT 1907-?? East Liverpool, OH Incorporated in 1907
USP Brunt (Henry) & Son Co.   ?-1895 East Liverpool, OH The 1892 Sanborn map of East Liverpool showed the plant was located at 1st St. and S. Market St. The name was Riverside Manufacturing Co. H. Brunt & Son, "manufacturers of door knobs and hard porcelain ware for electrical purposes." This was commonly called the Riverside Pottery or Riverside Knob Works.
USP Brunt (William) Pottery Co.   1847-1912 East Liverpool, OH The William Brunt Pottery was run by William Brunt from 1847-1856 with his son Henry joining him 1856-1895. The plant was also known as the Riverside Knob Works making door knobs and electrical porcelain. The pottery was sold after the death of William H. Brunt in early 1912 to his son, William S. Brunt, who was president of the former company. In early 1913, the pottery was leased to Taylor, Smith & Taylor China Co. of Chester, WV. The pottery made sanitary porcelain only but one source stated electrical porcelain, too. The plant was taken over in 1917 by General Porcelain Co.
USP Brunt Porcelain Co.   1920-1925 Worthington, OH (see Brunt Tile & Porcelain Co.) The company was listed in the 1922 Journal of the American Ceramic Society under the direction of George F. Brunt.
USP Brunt Tile and Porcelain Co.   1914-1920 Worthington, OH After G. F. Brunt sold his East Liverpool plant to General Porcelain Co. in 1911, he bought an old pottery in the suburbs of Columbus and refitted it to produce electrical porcelain. Brunt was president, H. D. Clark, vice president, J. T. Herbert, secretary, and W. F. Steale, treasurer and general manager. Production of tile ceased in 1920. The business was abandoned in 1925. Standard porcelain, cleats, tubes
Sup Bryant Electric Co. B. E. Co.; BRYANT; CHAPMAN 1889-1901 Bridgeport, CT Electrical supplies. The company by Waldo C. Bryant in 1888 and incorporated in 1889 in Bridgeport, CT. The expanding market for switches led to the purchase of the Perkins Electric Switch Company of Hartford on December 30, 1899. The Perkins plant and employees relocated to Bridgeport. The 1901 Bryant catalog still does not mention Perkins. The 1907 catalog was a joint Bryant/Perkins catalog, and so are later catalogs. The business grew rapidly and was in need of more capital for expanding the plant and purchasing equipment. Bryant turned to George Westinghouse. On April 10, 1901, Westinghouse purchased Bryant for $875,000 with $50,000 to be paid at the signing. The final payment was made in October of 1902. Westinghouse agreed that W. C. Bryant and L. W. Eaton would stay on as directors of Bryant Electric and Perkins Switch. The agreement was confidential and the merged company was operated as a wholly owned subsidiary. The reason for downplaying the Westinghouse connection was to keep Bryant distributors, who had exclusive franchises to sell Westinghouse’s competitor’s products, from dropping the Bryant product line.
Sup Buell (M. A.)   1870's   Electrical supplies
FP Buller & Co.   1880's London, England Hanly and Staffordshire potteries; 32 & 33 Queen Street
FP Buller, Jobson & Co.     London, England  
FP Bullers Ltd.   1868-1959 England Merged with Taylor, Tunicliff & Co.
Sup Bunnell (J. H.) BUNNELL 1880's-1930's New York, NY Electrical supplies: antenna strains, wireholders, Brookfield
USP Burgess & Co.     East Liverpool, OH In 1927, their address was 209 W. Fourth St.
FG Burlington Glass Works   1875-1885 Hamilton, Ontario By 1874 the Hamilton Glass Works had acquired the entire block surrounded by Macauley Street, James Street East, Hughson Street, and Picton Street, illustrating how successful it had become. The following year, however, some competition had developed in the form of the Burlington Glass Works. Founded by Edward Kent, this new company was located at the intersection of Burlington and MacNab Streets in Hamilton. Though the Burlington Glass Works was arguably the most prolific glass works of its day, this did not prevent it from being purchased by the Hamilton Glass Works in 1885. Though this event effectively ended competition between the two companies, in the end it was of little consequence since both glass works were bought up by the Diamond Glass Company in 1891.
USG Bushwick Glass Works   1864-?? Brooklyn, NY  
M Butler Hard Rubber Co.   1880's New York, NY Manufacturer of hard rubber for electrical insulation and other items. Specifically mentioned "rubber hook insulators" in an 8-1884 advertisement. By 1889-1890, they were making hard rubber insulators from the 7-10 patents granted to William Kiel. Most of the patents were applied for and granted in 1889, and assigned to Kiel, Butler and Turnbull of New York City. The patents describes creating a vulcanized plastic compound by soaking wood in oil and mixing with sulfur, crude rubber, and beeswax which is then passed through rollers prior to the vulcanization process.
Sup Buyer's Reference        
M Buzby (J.F.)        
  C. S. Knowles Co. [see Knowles (C. S.) Co.]        
USG Cadiz Glass Co.     Cadiz, OH From Dick Roller [referencing Cadiz Republican, April 15, 1886] "Cadiz Glass Co., Cadiz, OH, made shipment of insulators to Vera Cruz, Mexico last Monday. If these insulators suit the "greasers" they might organize a joint stock company and buy the glasshouse and move it there." [see article 3284]
M California Electrical Works   1877-1908 San Francisco, CA  Electrical Construction & Maintenance Co. was reorganized in June 1877 and incorporated as California Electrical Works. In May 1908 it was taken over by Western Electric Co. (see Seiler (Paul) Electrical Works)
USG California Glass Insulator Co.   1914-1916 Long Beach, CA Incorporate on January 14, 1914, with a capital stock of $150,000; subscribed $700.00. The following directors were named — J. G. Orth, John Morris, William Schade, M. L. Orcutt, Charles L. Eshelman, J. D. Taggart and Shirley Meyre.
USG California Glass Works   1882-1883 San Francisco, CA  
Sup Cambridge Electric Light Co. C. E. L. CO. 1887-1892  Cambridge, MA Cambridge Electric Light Co.; electrical supplies; glass insulators with embossing "C. E. L. CO."
FG Canada Glass Co.   1864-1877 Hudson, Quebec  
FG Canada Glass Works   1854-1860 St. Johns, Quebec Foster Bros.
FG Canadian Glass Mfg. Co.        
FP Canadian Line Material Co.   1930's-1972 Scarborough, Ontario  
FP Canadian Ohio Brass Co., Ltd.   1928-?? Niagara Falls, Ontario Formerly The Dominion Insulator & Mfg. Co. Ltd.
FP Canadian Porcelain Co., Ltd.   1912-1958 Hamilton, Ontario Associated with Locke Insulators, Inc.
USP Canton Insulator and Clay Co.   1896-1904 Canton, OH Went bankrupt
USP Canton Porcelain Co.   1912-1944 Canton, OH The company made brick 1912-1914. Insulators were made for one year in 1914, then started making children's toy clay marbles for Brown Shoe Co. and others until 1923 when they started making insulators again. Insulator production ceased in 1926. Then they made pottery for wholesaling to florists until closing in 1944. Insulator production was probably dry pressed porcelain for electrical house and building wiring.
USP Capital Porcelain Co.   1910's Trenton, NJ A 1917 Trenton newspaper listed this company with other electric porcelain companies.
USP Carey Ohio Porcelain Co. C. O. P. 1920's Carey, OH Electrical porcelain
FG Cartel Vidreria Monterrey     Mexico Logo VM interlaced in a circle same as Masnieres (France)
Sup Catalog Of Telegraphic Material & Electric Appliance       Charles T. Chester, supplies
Sup Central Electric Co.     Chicago, IL Electrical supplies
USP Central Porcelain Co.     Columbiana, OH  
USP Central Porcelain Works   ??-1907 Trenton, NJ Plant was sold in a Sheriff's sale since mortgage was held by the state.
FG Centro Vidreiro Do Norte Du Portugal, Lda.     Portugal  
USP Ceram Insulators   2001-Feb. 2004 Macomb, IL Purchased from Porcelain Products Co.; company based in Vienna, Austria; plant closed (see PPC Insulators)
USP Ceramic Allied Products, Inc.   ??-1931 Trenton, NJ Merged with Cook Pottery Co. in 1931
USP Ceramic Electrical Co.   1907-?? Charleston, WV  
USP Ceramic Specialties Co. RACO; circle C 1932-1955 East Liverpool, OH Formerly the Adamant Porcelain Co. and then the T. V. Milligan Porcelain Co. Milligan left the company in 1929 after purchasing the idle Ravenswood Porcelain Co. plant from General Porcelain Co. At that time, company name was changed to Peach Porcelain Co. In 1932, from either name change or purchase, the company became Ceramic Specialties Co. The company went bankrupt in 1955. Porcelain insulators marked RACO were made for the Raco Electrical Products Div steel bracket
USP Champion Porcelain Co. (see Jeffery Dewitt Insulator Co.)   1915-?? Detroit, MI The company made porcelain spark plug insulators.
USP Chance Co. (A. B.) [see A. B. Chance Co.]        
FG Charbonneaux & Cie (Charbonneaux & Company) ISOREX 1905-?? Reims, France The same as Verreries Charbonneaux, Verreries de Reims 
FG Chomel-Legrand CL in a diamond 1910-1958 Fourmies France Manufacturer of glass insulators
USP Cincinnati Porcelain Co.   1920-1927 Cincinnati, OH  Merged with Porcelain Products, Inc. The plant site was originally that of Strobl Pottery (1901-1910) and then Strobl Tile Co. (1910-1920).
FP CJI Porcelain Pvt Ltd   modern New Delhi, India Manufacturer of porcelain insulators
USP Clarken Co.   1963-?? Carey, OH The Clarken Co. purchased the dry process porcelain plant at Carey from A. B. Chance in 1963.
  Cliff, Joseph & Sons   1880's Northampton, England 2 & 4 Wharf
USP Climax Pottery Co.   ??-1916 Trenton, NJ This was the former plant purchased by Electric Porcelain Mfg. Co. in 1916.
FG CODARVI     Uruguay  
USG Cohansey Glass Mfg. Co.   1870-1900 Bridgeton, NJ  
Sup Colonial Electric Co.     Philadelphia, PA Electrical supplies, Hemingray
USP Colonial Insulator Co. COLONIAL; HI HEAT c. 1895-1950's Akron, OH Formerly known as the Colonial Sign Co. Maker of electrical porcelain. In 1927, their address was 943 Grant St.
USP Colonial Sign & Insulator Co. C. S. & I. Co.; C. S. I. Co. 1904-?? Akron, OH The plant was located at 955 and 973 Grant St. The company was formed from the merger of Colonial Sign Co. and Colonial Insulator Co.
USG Colorado Glass Works R. GOOD, JR.; GOOD 1896-1899 Denver, CO The Valverde Glass Works was started in 1887 as the Denver Art and Plate Glass Co. The name of the plant was changed in December 1887 to the Denver Flint Glass Co. R. Good, Jr. operated (leased) the defunct Valverde Glass Works from P. C. Thompson until it burned on June 27, 1899. The plant was rebuilt as the Western Flint Glass Co. by a group of young entrepreneurs who were sons of wealthy Denver businessmen.
Sup Columbian Electrical Co.   c. 1898-?? St. Joseph, MO Electrical supplies, standard porcelain, Brookfield insulators
USP Columbian Insulator Co.   Oct. 1901-1902 Akron, OH It was incorporated at Columbus, by L. M. Biggs, L. E. Biggs, Charles E. Breckenridge and Jacob Seeger to make all kinds of clay and porcelain insulators. The company merged with five other Akron/Barberton area potteries.
USO Condam Co.       Marking found on the patent model of the 1851 Goodyear patent rubber rams horn used in the wood block patented by Moses Farmer and John Batchelder on Sept. 14, 1858. It is in the Mike Guthrie collection.
USP Consumers' Insulator Co.     New Lexington, O. and Glasgow, WV  
USO Continental Rubber Works        
Sup Cook Electric Co.   c. 1898-?? Chicago, IL Started by Frank B. Cook. Telephone supplies, lightning arrestors, misc.
USP Cook Porcelain Insulator Co. COOK early 1920's-early 1930's Byesville, OH Headquarters was in Cambridge, OH. In 1927, the company was listed at Cook Porcelain Insulator Corp.
USP Cook Pottery Co. C. P. CO. 1897-1931 Trenton, NJ  Owner was Charles Howell Cook, a prominent resident of Trenton. Located on Prospect St, it was one of three potteries owned by Cook. Other companies were Etruria Pottery (Clinton St.) and Crescent Pottery Co. (Allen near the canal). In 1927, the address was listed as Prospect St. & P. R. R. The Cook Pottery Co. made electrical porcelain and plumbing fixtures.
USP Cook-Ceramic Co.   1931-1950's? Trenton, NJ  
Sup Cooke-Wilson Electric Supply Co.   ?? Pittsburg, PA Electrical supplies; U-98 probably made by Anderson Porcelain Co.
USP Cooper Power Systems   1985-1999  Macomb, IL  Company based in Waukesha, WI; sold plant to Porcelain Products Co. 
  Cooperativa de Artistas de Vidrio        
FG Cooperativa Integral de Vidriera de Colombia   present Colombia Coovinal S.A.
USP Coors Porcelain Co.   1920-1986 Golden, CO The predecessor of Coors Porcelain Co. was Herold China & Pottery Co., founded in 1910. Adolph Coors, founder of the Coors Brewing Co., took over the company in 1920, and it became Coors Porcelain Co. The company made chemical porcelain. The name was changed to Coors Ceramics Co. in 1986 to reflect its emphasis on technical ceramics. Early in 1942, Adolph Coors' grandson, Bill Coors, who had joined the company in 1939, received an urgent request for ceramic insulators for a government laboratory. Other ceramics producers needed six weeks to fill the order; Coors was able to do it in a matter of days. For several months the company continued to ship the insulators, knowing nothing of what they were to be used for. Only years after the war's end did Bill Coors discover that the shipments were actually destined for the Manhattan Project laboratories in Oakridge, where the atomic bomb was developed.
USP Coors Ceramics Co.   1986-present Golden, CO Name changed from Coors Porcelain Co. in 1986. In 1992 it came under the umbrella of ACX Technologies, when ACX became an independent holding company.
USG Corning Glass Works PYREX 1875-present Corning, NY  
Sup Cornish Wire Co. CORWICO   Williamstown, MA  
USP Coxon Electrical Porcelain Works (actually Electric Porcelain & Mfg. Co.)     Trenton, NJ In 1898, products were electrical supplies. The 1900 Trenton city directory does not list this company but it does list Electric Porcelain Co. and Harry Coxon associated with it along with Jonathan Coxon. We know Jonathan and Harry Coxon were the founders of Electric Porcelain & Mfg. Co., so undoubtedly this is the actual name of the company.
Sup Crescent Electric Co. ACME   Mountain Grove, MO Electrical supplies, rosettes, sockets, etc.
FG CRISA CRISA   Mexico  
FG Cristaleria, S.A.     Monterrey, Mexico  
FG Cristalerias de Chile S.A.   1945-1968 Santiago, Chile  
FG Cristalerias Rigolleau, S.A. VIDART   Buenos Aires, Argentina  
FG Cristales Mexicanos S.A.     Mexico  
FG Crown Crystal Glass Co., Ltd. C.C.G. 1926-?? Sydney, Australia In early 1926, the C. C. G. was formed by a merger of Crown Glass, Ltd. with the Australian Glass Manufacturers' Co., which owned a majority of the shares. C.C.G. merged with Australian Glass Manufacturers in 1942. In the 1940's, several other smaller glass companies were merged into C.C.G. and name was changed around 1950 to Australian Consolidated Industries.
FG Crystal Glass Co., Ltd.   1907-?? Sapperton, New Westminster, BC Manufactured bottles, fruit jars, lamp chimneys, and glass insulators
FP Crystal Porcelain Pottery Co., Ltd.   1880's Cobridge, Stoke-on-Trent, England Manufacturers of insulators, shackles, element cells for batteries, etc. Also telegraphic and electrical ware, porcelain tiles and insulating slabs.
USG Crystallite Products Corp. MAYDWELL 1927-1940 Glendale, CA The company was closely associated in ownership and management with the Electrical Products Corp. (organized in late 1925) and Diamond Electrical Manufacturing Co. (recently organized) of Los Angeles. Crystallite was incorporated in 1927. They purchased a factory site 150 x 180 feet near Western Ave. and San Fernando Road. The glass factory was in a building 75 x 180 feet. They produced street lighting globes, glass letters for electric signs, glass insulators, and other glass items for the manufacture of neon signs, etc.
FP Cullinan Industrial Porcelain Ltd.     South Africa  
USP Curran-Pfeiff Corp.     Metuchen, NJ  
USP Curry-McQuilken Co.   1908-?? East Liverpool, OH  
Sup Cutter Co. (George) JUPITER   South Bend, IN Electrical supplies, Cutter tree insulator CD 1038
USO Cutter (Scott G.)     Oswego, IL Manufacturers of tree insulators.
USP Daburn DABURN mid-1960's-present Northvale, NJ Electrical porcelain for airplane, antenna, feed-thru, feeder spreader, stand-off
FP Dalian Insulator Works   ~1915-present Dalian, China Formerly Dalian Porcelain Insulator Works
USP Davidson & Stevenson Porcelain Co. D&S 1913-1920 Newell, WV Standard electrical porcelain, cleats, knobs, tubes and novelties in both dry pressed and wet process porcelain. Also known to make six styles of wet process porcelain pin-type insulators. The Newell, WV factory was across the river from East Liverpool, OH.
USP Davidson Porcelain Co.   1920-1936 Newell, WV Incorporation notice said located in Chester, WV. The incorporators were C. C. Davidson, Willis Davidson, Sarah J. Davidson, and William E. Gillis, of East Liverpool, Ohio, and W. W. Ingram of Chester. Produced wet process porcelain pin-type insulators.
FP De Fuisseaux Freres Baudour (De Fuisseaux Brothers Baudour) [see Societe Anonyme Des Annciennes Usines De Fuisseaux, a Baudour]     Baudour, Belgium Porcelain insulators
USP Delta-Star   1957-1963 Lisbon, OH The old Thomas plant
USG Denver Flint Glass Co. [see Colorado Glass Works]     Denver, CO  
FG Diamond Flint Glass Co.   1903-1913 Montreal, Quebec In 1903 the Diamond Glass Company was reorganized as the Diamond Flint Glass Company in order to acquire Canadian rights to machines which mass-produced glass. What followed was a period of consolidation, the introduction of new techniques and forms, and the acquisition of more glass companies. After installing equipment for the mechanical production of glass, the Diamond Flint Glass Company reopened the Hamilton Glass Works in 1906. The newly resurrected glass plant didn't last long however since in 1912 it was destroyed by a fire. Some of the equipment was able to be salvaged and it was moved to the Dominion Glass plant, which was under construction at the time.
FG Diamond Glass Co.   1890-1902 Montreal, Quebec The Diamond Glass Company was incorporated in 1890 in Toronto but was funded by financial interests in Montreal. This company descended from various glass works starting with the opening of the St. Johns Glass Company in 1875. St. Johns became the Excelsior Glass Company in 1878, which in turn became the North American Glass Company in 1883. This was to be its final reorganization until 1890 when it became the Diamond Glass Company. Its purpose was as a vehicle for the consolidation of the Canadian glass industry. By acquiring control of numerous glass works throughout Canada (of which the Hamilton works were some of the first), the Diamond Glass Company helped to prevent foreign interests from entering into the Canadian market. In 1903 the Diamond Glass Company was reorganized as the Diamond Flint Glass Company in order to acquire Canadian rights to machines which mass-produced glass. What followed was a period of consolidation, the introduction of new techniques and forms, and the acquisition of more glass companies.
USP Diamond Porcelain Co.   1900-1911 Trenton, NJ Specialty Porcelain; merged into General Porcelain Co. A 1907 ad said the produced "transformer tubes, catenary spools, wall tubes, spark plugs, and high tension insulators of special design and all classes of wet process porcelain, as well as pressed specialties made by the dry process."
USP Diamonite Products Mfg. Co.   c. 1952-present Shreve, OH Manufacturer of products using Diamonite which is composed of about 95% alumina oxide. It was referred to as "wear-resistant polycrystalline alumina". Pin-type insulators were first reported in the early 1970's made of Diamonite which were coated with Teflon. Insulators are nearly indestructible and are 2-3 times as dense as typical porcelain. The Diamonite Products Mfg. Co. was owned by W. R. Grace & Co. and sold in July 1994 to Ferro Corp. Apparently Ferro reorganized the Shreve plant in 2003 and operates it as CerCo, LLC See patents 5,053,370 and 5,164,345 granted in 1991-2.
USO Dirigo       Composition insulators
Sup Dixie Electrical Mfg. Co.        
FG Dominion Glass Co., Ltd.   1913-1967 Wallaceburg (Hamilton), Ontario The Dominion Glass Company was founded in 1912 by the amalgamation of the Diamond Flint Glass Company and the Sydenham Glass Company (of Wallaceburg, Ontario). Production commenced in 1914 once the company had finished construction of its Chapple Street plant. In the 1920's, hand-blowing shops were replaced by a full line of automatic machines (which were subsequently discarded in 1940 with the arrival of new bottle-making equipment). In 1924 an addition was built in the form of a $40,000 building consisting of a machine shop and a stamping room. Though the plant had two furnaces initially, by 1958 a third was added along with a color tank for making green and amber glass. A decade later the company was expanding again with the start of a $4.25 million modernization project at its Hamilton and Wallaceburg plants. $2 million was spent expanding the glass furnaces and their related production facilities at the Hamilton plant, while $2.25 million was spent constructing new plant facilities and rebuilding the glass furnace at the Wallaceburg plant. Both plants installed final process electronic equipment to detect and reject imperfect bottles. These improvements boosted production at the Hamilton plant to 22 million bottles per year. In 1969, $8 million was spent on improving efficiency to help offset rising labor costs.
FP Dominion Insulator & Mfg. Co. Ltd.   1922-1928 Niagara Falls, Ontario Name changed to Canadian Ohio Brass Co.
FP Doulton & Co.   1880's London, England Lambeth Pottery London, S. E. and Burslem, Staffordshire. Manufacturer of accumulators, porous cells, battery jars, insulators in stoneware and white earthenware, knobs for tops of street lamps, caps for telegraph posts, porous plates (round and square), pipes with ground joints for preservation of electric wires underground, Slater Lewis's patent self-binding insulators, crucibles and general chemical ware. Awarded only metal at the International Electric Exhibition, London, 1882. Contractors to the Postmaster-General and Indian Government. (J. A. Berly's British, American and Continental Electrical Directory and Advertiser, 1883)
FP Doulton Insulators Australia Pty. Ltd.   1956-??   DIA
FP Doulton Insulators Ltd.   1900-?? London, England  
Sup Duck (J. J.) Co.        
Sup Dunham, Carrigan & Hayden Co.   Early 1900's San Francisco, CA  
USG Duquesne Glass Co.   Early 1900's Pittsburg, PA  
USG Duquesne Glass Works   1834-1886+ Belle Vernon, PA Duquesne marked insulator probably were not made by this company, but rather an unknown company
USG E. Wormser & Co.   c. 1854-1875 Pittsburg, PA  
  Eagle Electric Mfg. Co. EAGLE   Long Island City, NY Radio antennae insulators.
USP Eagle Porcelain Co.   prior to 1930   Located at Princeton and Chadwick Avenues
Pot Eagle Pottery Co.   1876-1898 Trenton, NJ The defunct plant was purchased in 1899 by James Tams, owner of Greenwood Pottery and Greenwood China Co. In 1917, the Trenton Potteries Co. purchased the old Eagle Pottery from Greenwood China Co.
Pot East End Pottery Co. E. E. P. Co. 1894-1903; 1905-1910 East Liverpool, OH The company was founded by S. Turnbull, J. Doekin, E. J. Owen, and Gus A. Trenle. Located on the north side of Railroad St. east of Boyce St. The East End Pottery Co. was started in 1894 on this site. Name changed to East Liverpool Potteries Co. in 1903 and then East End Pottery Co. in 1905. Later became East End China Co., Trenle China Co. and then refitted in 1917 as the Trenle Porcelain Co. to produce electrical porcelain. Cleats with marking E. E. P. Co. were probably the first electrical porcelain made at this plant.
USP East Liverpool Electrical Porcelain Co.   1901-1911  East Liverpool, OH Known as "Electrical Porcelain Co." and "Electric Porcelain Co."
Sup Edison General Electric Co.   circa 1890 New York, NY Electrical supplies located at 292 Avenue B
M Edison Storage Battery Co.     West Orange, NJ  
Sup Edwin Lewis Co.  E. L. CO. circa 1900 Boston, MA Electrical supplies; may have sold glass insulators with embossing "E. L. CO."
  Efficiency Electric Co.        
  E. I. V. (see SEDIVER)        
Sup Electric Appliance Co.     Chicago, San Fran., Dallas, New Orleans  Electrical supplies, Hemingray, Brunt standard porcelain, Fred Locke porcelain and glass
USO Electric Cable Construction and Maintenance Co.     Philadelphia, PA David Brooks, Jr. assigned his patent (383,097) to this company.
M Electric Good Mfg. Co.      Maine Patented knob
USG Electric Insulator Co.     Clarksburg, WV  
FP Electric Ordnance Accessories Co. Ltd.   1916-1928 Hanley, Stoke-on-Trent, England  
USP Electric Porcelain & Mfg. Co.   1895-1920's Trenton, NJ Company was incorporated in April 1895. They manufactured dry pressed porcelain insulators and credited with the first single-fired electrical porcelain items. Address was 309-315 Monmouth St. and State St. The president and owner was Jonathan Coxon with Harry E. Coxon vice-president and general manager, and R. M. Bonham secretary and treasurer. In 1897 after dropping Imperial Porcelain Works as a supplier of his insulators, Fred Locke had various styles made here. Most were marked with under-glaze ink markings with Fred Locke's name and patent dates. In 1916, the plant moved to the plant on New York Ave., which was the former plant owned by the Climax Pottery Co. At this time H. T. Paiste, of Philadelphia, was president, H. S. Yearsley was treasurer, and Fred Whitehead was superintendent. In 1927, the company was listed in the McGraw-Hill Electrical Trade Catalog. In 1923, Henry T. Paiste was president.
USP Electric Porcelain Co.  [see East Liverpool Electrical Porcelain Co.]   1901-1911  East Liverpool, OH Known as "Electric Porcelain Co." and "East Liverpool Electrical Porcelain Co."
Sup Electric Railway Equipment Co.        
Sup Electric Service Supplies Co. E.S.S.Co.      Jobber, electrical supplies, and sole outlet for Franklin Porcelain insulators
Sup Electric Service Supplies Co.        
Sup Electric Storage Battery Co.     Philadelphia, PA Chloride Accumulator battery insulator
Sup Electrical Construction & Maintenance Co. [see Pacific Glass Works] E.C. & M.CO.S.F. 1870-1877 San Francisco, CA  Company was organized on December 23, 1870. Company had the CD 123 insulator produced for use on the telegraph lines they built. The company was reorganized as the California Electrical Works.
USG Electrical Glass Corp.   Dec. 1889 to Nov. 1890 Sandwich, MA Plant owned by James Pennycuick but was unsuccessful making insulators there using his 1885 patent.  Most insulators were made at Sandwich Cooperative Glass Co. and some embossed with Diamond P.
USP Electrical Insulator Mfg. Co.   Sept. 1906 Barberton, OH Tried to take over the Barberton Pottery Co. using this name but failed [5962]
  Electrical Mfg. Co.        
USP Electrical Porcelain Co. E. P. Co. 1901-1911 East Liverpool, OH Merged into General Porcelain Co.
Sup Electrical Supply & Equipment Co.     New York & Pennsylvania Electrical supplies, Hemingray, Illinois Electric, Pittsburg, standard porcelain
Sup Electrical Supply Co.     Chicago, IL Electrical supplies, Fluid Insulator
USO Electrose Mfg. Co.   1893-1920's Brooklyn, NY Insulators made from the composition called "Electrose"
FG Electrovidro, S.A.   1980's? San Paulo, Brazil From purchase of VIFOSA by Sediver
FP Elekroporcelan Louny EPL 1957-present Louny, Czech Republic  
USG Ellenville Glass Works   1837-1896 Ellenville, NY Insulators made in 1886
Sup Elliot-Lewis Electrical Co.     Philadelphia, PA Electrical supplies, Hemingray
USG Elmer Glass Co.   1904-?? Elmer, NJ Formed with the purchase of the Novelty Glass Co.
Sup EMF Electrical Year Book     Chicago, IL Electrical directory of companies
USP Empire China Works   1867-?? Greenpoint, NY The company was started in 1867 by James L. Jensen making hardware trimmings and table ware. It started making electrical porcelain in plaster molds as early as 1879 for Waldo Bryant Electric Co. According to an early history written by Watts, they were credited to making the first electrical porcelain in the U. S. The plant was located from 144 to 156 Greene street (and Union St.), near Manhattan avenue in Greenpoint (Brooklyn) covering a space 175 feet by 100. In 1893, the plant was still owned by J. L. Jensen. (see article 4870). Empire China Works was still in business in 1919 and no reference past that date could be found.
Sup Empire City Electric Co.   1880's New York, NY Electrical supplies, glass insulators, standard porcelain
Sup Erie Electrical Equip. Co.        
Sup Erner Electric Co.     Cleveland, OH Electrical supplies (Hemingray, standard porcelain)
FG Esperanza, S.A.     Segovia, Spain  
USP Etruria Pottery     Trenton, NJ In 1882, proprietors were Ott & Brewer (Hart J. Brewer) and located on Clinton near BDRR. Later purchased by Charles H. Cook. Confirmed (Feb. 1904) maker of porcelain wall tubes from two to sixty inches long. (see Cook Pottery Co.)
Sup Ette Investment Co.   ~1900-1920 St. Louis, MO Line equipment
Sup Eveready Porcelain Co.       This was the sales name for split knobs made by Davidson Porcelain Co.
FG Excelsior Glass Co.   1878-1883 Montreal, Quebec  
M FALL RIVER POLICE SIGNAL     Fall River, MA  Embossing found on CD 134 and CD 133 has embossing "CITY FIRE ALARM"
FP FAPA, S.A.     Argentina  
USP Federal Porcelain Co.   1917-1927  Carey, OH Merged into Porcelain Products Inc. in 1927.
  FG; VEDOVELLI, PRIESTLEY & Cie, Ateliers de constructions electriques, (Electricbuilding workrooms)   c. 1900 Ivry / Seine, near Paris Radio-strains, named "maillons"
FG Fidenza Isolatori   1928-present Fidenza, Italy Owned by Sediver
FG Fidenza S.A.   1940's-?? Fidenza, Italy  
FG Fidenza Vetraria S.A.     Fidenza, Italy  
  FIL     Italy  
USP Findlay Electric Porcelain Co. BUCKEYE; F; diamond F; F E P Co 1910-1927  Findlay, OH Initially plant was leased from the U. S. Electric Porcelain Co.; merged into General Porcelain Co.
M Fleron (M. M.) & Sons        
Sup Fletcher (J. R.) Mfg. Co.     Dayton, OH Electrical supplies. Address was Second and Canal St.
  Florenz     Australia  
Sup Fobes Supply Co.     Portland, OR; Seattle, WA; San Francisco; Oakland, CA Electrical supplies
FG Folembray (Verreries de) [Glassworks of Folembray] FOLEMBRAY 1899-1954 Folembray, France  
  Fort Wayne Electric Works        
FG Foster Brothers Glass Co.   c. 1857-1878 Montreal, Quebec  
FP Fowler Brothers Potteries   mid-1930's- Sydney, Australia Or Robert Fowler Ltd.
Sup Frank C. Teal Co.        
Sup Frank H. Stewart Electric Co.     Philadelphia, PA Electrical supplies, tubes, Thomas and Brunt standard porcelain, Murdock knobs, Brookfield, Thomas pin-types
Sup Frank Ridlon Co.   early 1900's Boston, MA Electrical supplies, trolly hangers, wood strains, composition feeder wire insulators, Hawken tree insulator, Jumbo and other glass insulators, Brodie tree insulators
USP Franklin Porcelain Co.   early 1920's-1929  Norristown, PA Insulators sold by E.S.S.Co.
USP Fred M. Locke    1893-1902 Victor, NY see Locke (Fred M.)
USP Freeman (E. D.) Electric Porcelain Co.   1904-?? Trenton, NJ Company was incorporated on March 23, 1904. The principal office and place of business will be at 100 Hamilton avenue. The capital stock is placed at $25,000.
USG Fry (H. C.) Glass Co.   1901-1933 Rochester, PA  
FP Fukagawa Porcelain Koran   Arita, Japan The company was founded in 1875 in Arita near Nagasaki as a family business. Their rich history includes work as purveyor to the Japanese Imperial Family since 1910. In 1895 Ezaiemon Fukagawa founded a company 'Koransha' and started to produce porcelain for export to Europe and America. They have been making insulators since at least 1879. They made some of the first insulators used on the island to replace the "Varley double cup earthenware" insulators used on the original telegraph lines, which are still located in Western Japan today.
FP Fuller & Son     Bow, England British patents in 1867 and 1877
FP Gaskell and Grocett   1870-1969 Stoke-on-Trent, England  
  Gaynor Electric Co.     Louisville, KY Thomas F. Gaynor was granted patent 437,685 on October 7, 1890 for a color-coded glass insulator in order to distinguish it from other lines on a crossarm or pole.
USG Gayner Glass Works   1898-1926 Salem, NJ In 1874, John Gayner, Sr. was located at Waterford, N. J., where he became a member of a firm, his partner being S. J. Pardessus, of New York City. July, 1879, the firm of Gayner & Pardessus moved their business to Salem and at first employed only about seven men. The firm was dissolved when the sons of Mr. Gayner became partners in the business. The company was incorporated on December 8, 1898 in Salem, NJ by John Gayner, Edward J. Gayner, and J. William Gayner. John Gayner, Sr. died on October 20, 1925 at the age of 94. (see ID 7580) A fire in May 1926 destroyed the large warehouse.
USP General Ceramics Co.       Steatite insulators
USP General Electric Co.   1892-1897? Schenectady, NY General Electric produced early dry pressed porcelain (U-701, U-744, U-935A). Their catalogs furnished electrical supplies, Star glass insulators, Brookfield, standard porcelain, tubes, Locke porcelain and glass insulators.
USP General Electric Porcelain Co.     East Liverpool, OH Plant leased by General Electric and run by T. F. Anderson. The plant is known to have produced standard electrical porcelain in the early 1920's.
USP General Porcelain Co. GEE PEE; G. P. Co. 1911-1927  Parkersburg, WV  Initial mergers in 1911 included Anderson Electric Porcelain Co., G. F. Brunt Porcelain Co., Electrical Porcelain Co., and Ohio Porcelain Co. at East Liverpool, OH, U.S. Electric Porcelain Co. in New Cumberland, WV, and Findlay, OH and three plants in Trenton, NJ of Sun Porcelain Co., Diamond Porcelain Co. and one unknown.
M General Post Office GPO 1912-present England Post office in England controlled all communications by telephone and telegraph using insulators made with the marking GPO.
Sup General Radio Co.     Cambridge, MA Radio and antenna supplies, radio antenna insulators
  Gijon Fabril, S.A.     Spain  
USP Gladding Ceramic Insulator Co., Inc.   1963-?? San Jose, CA  
USP Glasforms, Inc.   ??-present San Jose, CA Manufacturer of insulators including electrical insulators & strain insulators. Materials include glass, carbon, exotic fibers, hybrids & epoxy resins.
FG Glass Insulators Ltd.     South Africa  
Sup Gleason (E. P.) Mfg. Co.     New York, NY Electrical supplies; Located on 20 W. Houston St.
USG Gleason-Tiebout Glass Co.   1903-?? Maspeth (near Brooklyn), NY Manufacturer of glass insulators, novelties, etc.
USP Globe Porcelain Co. GLOBE 1910's Trenton, NJ Manufacturer of electrical porcelain
USG Good (Robert), Jr. [see Colorado Glass Works] GOOD, R. GOOD, JR.   Denver, CO  
  Goodrich Hard Rubber Co.     Akron, OH  
M Gould Storage Battery Co.     New York, NY Battery supplies and battery rest insulator
USP Gould, Inc.   1976-1980 Victor, NY  
USG Gray and Hemingray   1848-1856 Cincinnati, OH and Covington, KY Ralph Gray and Robert Hemingray leased a lot on Mayor’s Alley in Cincinnati on 5 April 1848, and began a business known as the Gray & Hemingray Glass Works. Four years later, they purchased a small parcel of land in Covington near the intersection of Second Street and Madison Avenue in 1852 on which they constructed manufacturing facilities for the glass works. The sales room remained on Hammond street in Cincinnati. The first name change was witnessed in 1856 when the glass works became Gray, Hemingray & Bros. to recognize their brothers, Anthony Gray and Samuel J. Hemingray.
USG Gray, Hemingray & Bros.   1857-1860 Covington, KY The Gray & Hemingray Glass Works was changed to Gray, Hemingray & Bros. to recognize their brothers, Anthony Gray and Samuel J. Hemingray. Note that neither Anthony nor Samuel became actual partners in the business at that time.
USG Gray, Hemingray & Bro.   1861-1863 Covington, KY Anthony Gray chose to terminate his employment with the company sometime during 1861, apparently because of health problems. He was a glass blower, an occupation that was particularly wearing on an individual. The name of the glass works became Gray, Hemingray & Bro. upon Anthony’s departure. Anthony died 27 April 1865. The glass works became known as Hemingray Bros. & Company in 1864 following the death of Ralph Gray on 20 November 1863 and the subsequent settlement of his estate.
Sup Graybar Electric Co.       Electrical supplies
M Great Western Railway GWR   England Made by Bullers Ltd
Sup Greeley (E. S.) & Co.     New York, NY The E. S. Greeley & Co. were the successors to L. G. Tillotson & Co. The carried electrical supplies such as standard porcelain, wooden cleats, Tillotson glass insulators, Brooks rams horn, glass blocks, rubber rams horns, double headed rubber rams horn, B&O and O'Brien Brookfield insulators, Victor forestry insulator, lightning rods and lightning rod insulators
USP Greenwood China Co.     Trenton, NJ  
Pot Greenwood Pottery Co.   1861-?? Trenton, NJ In 1882, located East Canal near State. In 1898, products were hardware, electrical and sanitary specialties.
  H. G. CO. [see Hemingray Glass Co.] H. G. CO.      
USO H. K. Porter Co. [see Porter (H. K.) Co.]        
Pot Hall China Co. HALL 1894-1930 East Liverpool, OH Nothing is certain about electrical porcelain manufacture by this company except telephone knobs have been found with HALL embossing. The company was located at Harvey and Elizabeth Sts. The company at one time or another (1905-1927) had purchased and operated four other small potteries. In 1930, they built a new plant at Klondyke where remnants of electrical porcelain can be found. However, it was customary to use dumpage for fill prior to new construction, so the electrical porcelain remnants could have come from one of the other small plants.
FG Hamilton Glass Works   1864-1898 Hamilton, Ontario Hamilton Glass Works founded in 1864 by four men: Lyman Moore, John Winer, George Rutherford, and Nathan Gatchell (who was the only co-founder with previous experience, having owned the Lancaster Glass Works in Lancaster, New York). The following year Nathan Gatchell left the company and his interest was subsequently acquired by George E. Tuckett and John Billings. However, these two men didn't find the glass business very exciting and in 1866 they returned to the tobacco business instead. The Hamilton Glass Works was originally located at the eastern end of the block surrounded by Macauley Street, James Street East, Hughson Street, and Picton Street. By 1874 the company had acquired the entire block, illustrating how successful it had become. The following year, however, some competition had developed in the form of the Burlington Glass Works. Founded by Edward Kent, this new company was located at the intersection of Burlington and MacNab Streets in Hamilton. Though the Burlington Glass Works was arguably the most prolific glass works of its day, this did not prevent it from being purchased by the Hamilton Glass Works in 1885. Though this event effectively ended competition between the two companies, in the end it was of little consequence since both glass works were bought up by the Diamond Glass Company in 1891.
FP Hamilton Porcelains, Ltd.     Hamilton, Ontario Obtained Porcelain Products Inc. molds and made small insulators 1930-1945.
USP Hammond Cleat & Insulator Co. HAMMOND 1890's Boston, MA Patented cleats (see patent 511,611) (see patent 511,612)
USG Harloe Insulator Co.   Jan. 1902-1906 Hawley, PA The company was organized with $150,000 capital by J. S. Welsh, president; Wm. Gregg, vice president; Myron T. Snyder, treasurer; Marcus Tuttle, secretary, and Morton Harloe, the inventor, general manager. Other stockholders were P. J. Bowers, George S. Thompson, of Hawley; Wilton S. Bloes and George E. Shay, of Peckville, PA.
USG Harloe Insulator Co.   Mar-Oct 1903 Elmer, NJ  
USP Hartford Faience Co.   1905-1947  Hartford, CT Dry pressed insulators made as early as 1905, then in 1925 began making wet process porcelain insulators
  Heinrich Co.   1904-?? Selb, Bavaria  
USG Hemingray Bros. & Co. HEMINGRAY 1864-1867 Covington, KY The glass works became known as Hemingray Bros. & Company in 1864 following the death of Ralph Gray on 20 November 1863 and the subsequent settlement of his estate. Ralph Gray’s will stipulated that his undivided half interest in the business be sold and the proceeds placed in trust for the benefit of his widow, Ann Gray. Robert Hemingray was named executor of the estate and maneuvered the sale to family members rather than placing Ralph’s interest on the open market. These were the “war years” and Robert no doubt was concerned about the introduction of a new and unknown partner into the business during these trying times. The “Hemingray Brothers” were Robert Hemingray, Samuel J. Hemingray, and Joseph C. Hemingray. Joseph C. Hemingray was a lawyer and banker in Leavenworth, Kansas, at the time of Ralph Gray’s death and it appears that he was able to provide the funds that enabled the Hemingray family to acquire Ralph Gray’s undivided half interest in the glass works. The “Company” consisted of James L. Foley and Richard Evans. Samuel J. Hemingray, Joseph C. Hemingray, James L. Foley, and Richard Evans each purchased one-fourth of Ralph Gray’s half interest in the company. Richard Evans was a brother-in-Law of Robert and Samuel J. Hemingray. Joseph sold his one-eighth undivided interest in the company to Robert Hemingray about a year later and returned to Kansas. Following the death of Samuel J. Hemingray on 10 September, 1866, the business became known as R. Hemingray & Co.
USG Hemingray (R.) & Co. HEMINGRAY 1868-1869 Covington, KY Following the death of Samuel J. Hemingray on 10 September, 1866, the business became known as R. Hemingray & Co. Papers of incorporation were filed with the Commonwealth of Kentucky and approved by the General Assembly on 21 March, 1870, at which time the glass works became the Hemingray Glass Company.
USG Hemingray Glass Co. HEMINGRAY/H.G.CO./H 1870-1933 Covington, KY/Munci, IN Hemingray Glass Company. The company retained this name until May 2, 1933, when the Owens-Illinois Glass Company purchased the company on April 25, 1933. Papers filed with the Commonwealth of Kentucky on for the dissolution of the corporation were approved by the General Assembly on ________ 1933. The company did continue to exist on paper until 1938 when all the pending litigation was finally resolved.
Sup Hendrie & Bolthoff Mfg & Supply   ??-1940's Denver, CO Electrical supplies
Sup Henry L. Walker Co.       Electrical supplies
FP Hermsdorf-Schomburg-Isolatoren G. M. B. H.     Hermsdorf, Thuringen, Germany  
FP HESCHO     Japan Porcelain for export to Canada
FP Hightension Electrical Industries   modern Haora, India Manufacturer of porcelain insulators
Sup High Tension Electrical Specialty Co.     Abington, MA Electrical supplies
FP Hindustan Chemicals   modern Khurja, India Manufacturer of porcelain insulators
USG Homer Brooke     Long Island City, NY See Seidlmyer Bros. Glass Works
  Homer Brooke Glass Co.   1908-1926   Company formed solely to grant licenses to glass manufacturers for utilizing his patents
  Homer Brooke Mold Co.   1892-1908? New York, NY Maker of molds to press glass.
FG Hope Glass Works   1880-90's Barnsley, York, England Dan Rylands received patent gb1889-0016537 for cylindrical glass insulator. He was employed by the Hope Glass Works.
FP Hoyang Electrical Industry Co., Ltd.   modern Taipei, Taiwan  
Sup Hubbard & Co.     Pittsburg, PA Electrical and pole line supplies. Address was 6301 Butler St.
Sup Hubbell (Harvey), Inc. HUBBELL   Bridgeport, CT  
FP Hunan Zhongnan A&T Co., Ltd     Changsha, Hunan, China Manufacturer of porcelain insulators of all types
FP Hunsruck Porzellanfabrick     Emmelhausen, Germany  
  Ideal Insulator & Electrical Mfg. Co.   1909-?? Missouri Taken from a stock certificate. President was Alonzo W. Slayback
FG Iittala Lasitehdas     Finland  
USP Illinois Edison Porcelain IEP, LM 1957-1958 Macomb, IL IEP marking switched to LM
Sup Illinois Electric Co.     Chicago, IL Electrical supplies
USP Illinois Electric Porcelain Co. ILLINOIS 1910-1953 Macomb, IL Manufacturer of wet process porcelain insulators
USP Illinois Electric Porcelain Co. BULL DOG; MACOMB 1910-about 1919 Macomb, IL Dry pressed insulators made by Illinois Electric Porcelain Co. usually with the embossed MACOMB marking
Sup Illinois Electrical Material Co.     Chicago, IL Electric railway supplies
USP Illinois McGraw Electric Co.   1954-1957 Macomb, IL  
  IMEC     Italy  
USP Imperial Porcelain Works   1891-1930's Trenton, NJ Company in specialty porcelain business to WW II (see patent 508,687). They were listed in the 1927 McGraw-Hill Electrical Trade catalog. The company was listed in the 1922 Journal of the American Ceramic Society under the direction of B. B. Dinsmore.
USG Independent Insulator Co.   1904-?? New York, NY The company was incorporated on November 10, 1904 with a capital of $250,000 by Milton Greenebaum (NYC), C. Hull (Brooklyn), and H. M. Wells (Passulc, NJ)
FP Indepor Inc.   1990-?? Medicine Hat, Alberta  
USG Indiana Glass Co. (1967)   1907-2002 Dunkirk, IN  
FP Industria Milanese Elettro Ceramica (Milanese Electro Ceramics Industry) IMEC   Milan, Italy Manufacturer of porcelain insulators
USP Industrial Ceramics, Inc. PINCO Dec. 1985-1987 Lima, NY Purchased Lima plant and continued to use the PINCO marking until they ceased the manufacture of pin-type insulators in 1987 (see Porcelain Insulator Corp.)
USP Interpace Corp.       Lapp Insulator Co. was a division of Interpace at one time.
FP Iran Insulator Co.   ??-present Saveh, Iran  
  Iron Glass Works (see American Iron Glass Pipe and Plate Co.)     Haverhill, MA It was also referred to as the Iron Glass Co.
  ISOBLOC (??)     France  
USP Isolanite Manufacturing Co., Inc. ISOLANTITE c. 1905-present Stirling, NJ Manufacturer of steatite, high alumina, and cordierite insulators for antenna strain, standoff, lead-in, bushings, spacers, suspension and custom applications.
FG ISOREX     France See Charbonneaux & Cie
USP I-T-E Imperial Corp.   1953-1976 Victor, NY  
Sup J. E. Saunders & Co        
Sup J. H. Bunnell & Co.       Electrical supplies: antenna strains, wireholders, Brookfield
Sup J. J. Duck Co.        
Sup J. H. Parker & Son, Inc. [see Parker (J. H.) & Son, Inc.]        
  J. Stolle Niemen        
Sup James Edwards & Son   1870's-1880's Burslem, Staffordshire, England Advertisement February 1878 in C&GJ stated electrical insulators
FP Jarsan Electric Co., Ltd.     Taipei, Taiwan  
USP Jeffery-Dewitt Co. (see Jeffery Dewitt Insulator Co.)   1908-1915 Newark, NJ/Detroit, MI The company made porcelain spark plug insulators.
USP Jeffery Dewitt Insulator Co.   1915-1952 Kenova, WV Dr. Joseph A. Jeffery (a dentist), his brother Benjamin A. Jeffery (a machinist), and Benjamin's brother-in-law, Mortimer C. Dewitt (a grocer) started the Jeffery-Dewitt Co. The two brothers filed for a spark plug patent in mid-1906 and about that time opened the Reliance Automobile Co. in San Francisco. Jeffery-Dewitt Co. apparently was started in 1908 in Newark, NJ to make Reliance spark plugs. It also made porcelain for sanitary ware, insulators, tumbling jars, crucibles, etc. In February 1910, they moved the porcelain spark plug plant to Detroit, MI. In January 1916, Robert Johnston filed for a patent for a thick porcelain suspension insulator and assigned it to the Jeffery-Dewitt Co. The patent was not granted until February 1920 (1,329,770). During the patent pending period, orders for thick porcelain insulators exceeded expectations. The original kiln, in Detroit, was designed for making spark plug bodies and was too small for the rapidly expanding high voltage insulator business. In 1915, the Jeffery-Dewitt Co. was purchased by the Champion Spark Plug Co. in order to gain Dr. Jeffery's knowledge of spark plug porcelain in an effort to compete with their rival competitor, the Champion Ignition Co. (AC). In early in 1916, Champion purchased a site on the Ohio river at Kenova, WV to build a plant for the manufacture of thick electrical porcelain insulators. However, the plant was not ready until late 1918 and flooding on the Ohio River, which remained a problem throughout the history of the Kenova plant, kept the plant from production until early 1920, the same year that the patent was granted. So how were the orders filled 1915-20? In a letter from the Champion Archives stated that JD contracted to other electrical porcelain manufacturers to make the porcelain bodies. These companies were Pittsburg High Voltage Insulator Co, Ohio Brass, and Thomas. Specimens of three pre-patent insulators are: 1) Tines of spider embossed JD Co Detroit Michigan Patent Pending. Under top tine there is the 1918 Pittsburg date stamp and it has a light drippy blue, not true JD blue glaze; 2.) Same insulator but without control date stamp; 3.) No marking, dark gray glaze. The first two are slightly smaller than insulators with the 1920 patent date. The third is slightly larger. Others reported but never confirmed are: 1) JD blue glaze with Patent Pending (blue under-glaze ink stamp on top neck arch). This is possibly the initial production at the Kenova Plant; 2) White glaze with black under-glaze ink Patent Pending marking; 3) 1920 manufacturing date only and it does not have marking referencing Patent Pending. The Kenova plant was destroyed by fire on October 29, 1952.
FG Jenaer Glaswerk Schott & Gen.     Jena, Germany  
Sup Jerome Redding & Co.       Electrical supplies: CD 133, porcelain Spool
FP Jobson Bros.   1880's Dudley, England Phoenix Works
FP Johann Haviland   1907-?? Waldershof, Bavaria  
USP John Maddock & Sons     Trenton, NJ In 1898, products were sanitary specialties
Sup Johns-Manville (H. W