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February 1999

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1919 Postcard containing insulators 1919 Postcard containing insulators

Three pictures taken at the Smithsonian Institution :

A drawful of insulators! A drawful of insulators!

The "House Insulator" The "House Insulator"

U-978 - threadless or threaded? U-978 - threadless or threaded?

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Last updated Thursday, February 4, 1999