Horatio Read's Insulator Patent Page, Closeup of Description and Text. May 29, 1871.
By Joe Maurath, Jr.; posted April 1, 2023
View Original: Click to zoom, then click to magnify (838 x 358) 64KB
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Click "Previous" for a view of the entire patent page. It seems like these thimbles were possibly used so that threaded insulators could be used on threadless pins as an adaptor? |