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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 503
o o ng:i. ng.3. … lST-vC+jO . . PHGio-urnc (No Model.) No. 489,423, 2 Sheets—Sheet 2. J. P. TIRRELL. ELECTRIC TIME ALARM. Patented Jan. 3, 1893.Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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