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Rubber pin-type insulator, ca. 1930

Rubber pin-type insulator, ca. 1930

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Rubber insulators were a common replacement for glass pin-type insulators on telephone lines between 1930 and 1980.

In some areas, the glass insulators had proved tempting targets for thrown rocks or gunfire.

Insulators are needed on electric lines to prevent the electricity from "leaking" out of the wire.

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