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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 619
T\£&ie>55P<) /h&O^tr^J o * c^L. 9r<$<66/& <&#>■ (No Model.) No. 491,557, 2 Sheets—Sheet 2. G. W. HEENE. WORKMANS TIME RECORDER. Patented Feb. 14, 1893, … JjnV&rj^oif,Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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