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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 417
3 Fig.2 THE NORRiS PETERS CO. PHOTO-UTMO (No Model.) No. 486,838. 2 Sheets—Sheet 2. M. Y. B. ETHRIDGE. ELECTRIC CLOCK. Patented Nov. 22, 1892. … r,w. *h W/ T/VE5SE~S. //VV£-A/r£7/W .Ui. I/./?). U&^JL^^Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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