U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 431
TH£ ECKERT UTH06MPHING CO., WASHINGTON.. D. C. (No Model.) No. 486,977, 5 Sheets—Sheet 5. R. D. MORGAN. WORKMANS TIME RECORDER. Patented Nov, 29, 1892.
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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