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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 389
(No Model. No. 486,458 6 Sheets—Sheet 5. J. GANSS. TIME STAMP. Patented Nov. 22, 1892. Ma.AClocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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