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U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 257
(No Model.) No, 481,919, F. BENNER.ELECTRIC G-UEST CALL. 2 Sheets—Sheet 2. Patented Aug. 30, 1892. -<?oClocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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