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 393
adjustable re-sistance and one or more electro-magnets areintroduced, as and for the puqioses set forth. 2. The combination, with a chemical tele-graphic receiving-instrument, of several elec-tro-magnets and a switch, ft, to connect moreor less of said magnets in a shunt-circuit, forthe purposes… … United States Patent Office. THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELFAND GEORGE HARRINGTON, OF WASHINGTON, D. 0. IMPROVEMENT IN CIRCUITS FOR CHEMICAL TELEGRAPHS. Specification forming pari of Letters Patent No. 147,314) dated February 10,1874; application filed July 29, 1873.…
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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