U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 803
■ NORRIS PCTEBS CO PHOTO-UTHO WASM.wGTOn. I (No Model.) No. 498,710, C. S. GIBSON. ELECTRIC TIME ALARM. 3 Sheets—Sheet 2. Patented May 30, 1893. … Wifr)«
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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