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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 75
TTvi/eTvtbr-, tyc/to.t?^ ^s?6di/. *No Model. M. MARTIN. WORKMANS TIME RECORDER. 2 Sheets—Sheet 2. No. 475,458, Patented May 24, 1892. ri3 .3. … ***&*,Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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