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U.S. patents covering time keeping mechanisms (1923)
United States. Patent Office · [Washington, D.C.] : U.S. Patent Office · leaf 934
Oct. 23,1923. 1,471,956 G. GUNTHER COMBINED CLOCK AND LETTER BALANCE … Tnoenix>f Gotffiru0)Giinf/>er /fiforrteyClocks and watches
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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