U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 353
Fi<r 4 … & Fiy.5 -*L S a s 4 x z * 2 s < « < 3 JI <Jr?ce///or. United States Patent Office. WILLIAM HENRY MARTIN, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TOTHE ACCURATE TIME STAMP COMPANY. TIME-STAMP. SPECIFICATION forming part of letters Patent No. 485,830, dated November 8, 1892. Application…
Clocks and watches
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