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U.S. patents covering time keeping mechanisms (1923)
United States. Patent Office · [Washington, D.C.] : U.S. Patent Office · leaf 62
Jan. 9, 1923. 1,441,389. S, C. VINCENT. TOY WATCH. FILED MAR. 21, 1922. z ^9-Clocks and watches
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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