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U.S. patents covering time keeping mechanisms (1923)
United States. Patent Office · [Washington, D.C.] : U.S. Patent Office · leaf 126
Jan. 16, 1923. 1,442,312. R. WATSON. MEANS FOR CONTROLLING THE IGNITION CIRCUITS OF AUTOMOBILE ENGINES. ORIGINAL FILED DEC. 2, 1920.Clocks and watches
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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