Collection of United States patents granted to Thomas A. Edison, 1869-1884 (1869)
Edison, Thomas A. (Thomas Alva), 1847-1931, Peters, N. (Norris), lithographer, Hammer, William Joseph, 1858-1934, former owner. DSI, Edison, Thomas A. (Thomas Alva), 1847-1931, inscriber. DSI, United States. Patent Office · Washington, D.C. : U.S. Patent Office · leaf 421
a weight atthe end of a lever, in combination with a cir-cuit-closer and connections, substantially asset forth. 3. A telegraphic alarm and signaling appa-ratus, formed of two or more levers with cir-cuit-closing surfaces contained within a box,with finger-pieces outside said box, substan-tially as… … United States Patent Office THOMAS A. EDISON, OF NEWAEK, NEW JEESEY, ASSIGNOE TO HIMSELFAND GEOBGE HAEEINGTON, OF WASHINGTON, DISTRICT OF COLUMBIA. IMPROVEMENT IN DUPLEX CHEMICAL TELEGRAPHS. Specification forming part of Letters Patent No. 156,843, dated November 17, 1874 ; application filed March…
Trade catalogs · Patents · Edison, Thomas A. (Thomas Alva), 1847-1931 · Inventions · Telegraph · Electric machinery · Electric apparatus and appliances · Phonograph · Telephone · Motors
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