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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 351
Fzcs 2. … .chrt*Ji~^ (No Model. No, 485,639, 2 Sheets—Sheet 2. W. H. MARTIN. TIME STAMP. Patented Nov. 8, 1892. Ficr 3 ]?* At m* 7 *Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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