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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 781
SZji ve nt7o n. • (No Model.) No. 497,331 W. B. MARTINDALE. AUTOMATIC TIME STAMP. 2 Sheets—Sheet 2. Patented May 16, 1893. … JE?Zg3Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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