U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 7
INVENTOR. BY /- ATTORNEYS LIBRARY N. Y. Univ. ited States Patent Office, HENRY MAY, OF SCRANTON, PENNSYLVANIA.WATCHMANS TIME-RECORDER. SPECIFICATION forming part of Letters Patent No. 472,896, dated April 12, 1892. Application filed June 5, 1891. Serial No, 395,237. (No model.) To all whom it may…
Clocks and watches
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