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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 345
In<venloy\ No Model.) 2 Sheets—Sheet 2. J. A. TILDEN. WATCHMANS ELECTRIC TIME RECORDER. No. 485,591. Patented Nov. 1, 1892. J%. 3, … HYhtnesses:Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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