U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 751
, onearranged to make a revolution once in twenty-four hours the other being arranged to makea revolution once in a«-week, series of elec-tric contacts arranged to be touched by thearms, removable circuit closing pins for en-gaging said contacts electric alarm bells, and the… … (No Model. 3 Sheets—Sheet 2. J. C. HINCHMAN. AUTOMATIC TIME PRINTER AND INDICATOR. No. 496,310. Patented Apr. 25, 1893. J?Jtgi £•,
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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