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U.S. patents covering time keeping mechanisms (1923)
United States. Patent Office · [Washington, D.C.] : U.S. Patent Office · leaf 676
Aug. 14, 1923. 1,465,090 W. E. PORTER CHIME AND STRIKE CLOCK Filed June 15. 1922 … ^5 -7 J\ <7 <Z^£~^Clocks and watches
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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