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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 671

An illustration from Collection of United States patents granted to Thomas A. Edison, 1869-1884, 1869, leaf 671
milar device, substantially as specified. 2. The combination, in a closed circuit, ofa receiving - magnet, a telephone, an electro-magnet, or its equivalent, and an apparatusfor reversing the connections of the same inthe circuit, a rheostat or resistance, a shuntto the same, and a key,… … United States Patent Office THOMAS A. EDISON, OF MENLO PAEK, NEW JEESEY.IMPROVEMENT IN MAGNETO - ELECTRIC MACHINES. Specification forming part of Letters Patent No. 218,166, dated August 5, 1879; application filed December 9, 1878. To all wliom it may concern: Be it known that I, Thomas Alva…

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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