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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 723
fflB B3 EH K H IB 11 m ffl m aw h mmfflfflfflfflHfflH … Er9Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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