Forestry Insulators in Catalogs

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Porcelain Products Catalog 60 (circa 1955-1960)

Federal Porcelain, 1919                                                                                          Graybar, 1941

Illinois Electric Porcelain Co., 1921

(Macomb and Triangle M)

Joslyn, 1926 (left) and Joslyn, 1934 (right)

Joslyn, 1941

Knox Porcelain Corp., 1938

Knox Porcelain Corp., 1953

Porcelain Products, Inc., 1930

Porcelain Products, Inc., 1930

Thomas, 1920 (left) and Western Electric, 1912 (right)

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