Insulators Home > Insulator Styles > Glass > Non-Pintype > CD 1040
US Patent 110,645 on January 3, 1871 by John Garity of East Birmingham, PA was for "a solid insulator (pin and insulator combined) designed to screw into the top of the crossarm", implemented in CD 1040. : http://www.nia.org/timeline/1870.htm
Insulators Home > Insulator Styles > Glass > Non-Pintype > CD 1040
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