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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 82
V^vv k \ v\ … VNV.VAW \xV (No Model. 2 Sheets—Sheet 2. F. M. SCHMIDT. ELECTRIC SELF WINDING CLOCK. No. 475 809, Patented May 31, 1892, fasClocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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