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U.S. patents covering time keeping mechanisms (1923)
United States. Patent Office · [Washington, D.C.] : U.S. Patent Office · leaf 194
Feb. 13, 1923. 1,445,214 H. HOLLINGDRAKE ET AL IN MOTION RECORDER FOR VEHICLES 2 sheets-sheet 2 Filed Sept . 1 , 19?] … J^mJ.Clocks and watches
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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