U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 679
THE NoRRIi F (No Model.) 4 Sheets—Sheet 4. H. AUDEMARS & H. SANDOZ-SANDOZ. REPEATING MECHANISM FOR TIMEPIECES. No. 494,727. Patented Apr. 4, 1893. … 3%f.f-
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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