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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 427
CL •—^^r (No Model.; No, 486,977 5 Sheets—Sheet 3. R. D. MORGAN. WORKMANS TIME RECORDER. Patented Nov. 29, 1892. Qfr^. <3>Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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