Chair Legs??

By William Burger; posted February 6, 2017

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I have these 4 insulator "legs" and I am hoping somebody out there can tell me how they were used. They show signs of many years of usage, kinda like a chair leg insulator. Approx. 12" tall and are threaded to screw into something. embossed C.F. Birtman and Co. Any help will be appreciated. Wm.