U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 209
i «T(«S CO . PHOTO-liT United States Patent Office, FRANZ WELLEBA, SR., FRANZ WELLEBA, JR., AND LUDWIG WACHTER, OF VIENNA, AUSTRIA-HUNGARY. ADVERTISING-CLOCK. SPECIFICATION forming part of Letters Patent No. 479,687, dated July 26,1892. Application filed July 24, 1891. Serial No, 400,621. (No…
Clocks and watches
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