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U.S. patents covering time keeping mechanisms (1923)

United States. Patent Office · [Washington, D.C.] : U.S. Patent Office · leaf 404

An illustration from U.S. patents covering time keeping mechanisms, 1923, leaf 404
Apr. 24, 1923. 1,453,086 A. VARAUD TIME INDICATOR Original Filed Aug. 11, 1920 4 Sheets-Sheet 1

Clocks and watches

Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.

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