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U.S. patents covering time keeping mechanisms (1923)
United States. Patent Office · [Washington, D.C.] : U.S. Patent Office · leaf 626
July 31, 1923. 1,463,253 J. F. CERMAK TIME SWITCH Filed Nov. 24. 1920 2 Shetts-Sheet 1 ^k»r/ ^J- … /J INVENTOR. BY rMud& r^Lc ATTORNEYSClocks and watches
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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