U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 805
: MjHRi, PETtWi CO.. photo-LiTnO., Washington, O. c. (No Model.) No. 498,710. C. S. GIBSON. ELECTRIC TIME ALARM. 3 Sheets—Sheet 3. Patented May 30, 1893. … ^Zy-. G. r
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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