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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 663

An illustration from Collection of United States patents granted to Thomas A. Edison, 1869-1884, 1869, leaf 663
ng to pulsate thecurrent on the line, a key to shunt the mainline and prevent the action therein of the pul-sator, and three receiving-instruments in thebridge, one operated by reversal of current,the other by changes in the strength of the cur-rent, and the third by the pulsations of thecurrent,… … United States Patent Office. THOMAS A. EDISON, OF MBNLO PAKE, NEW JEESEY, ASSIGNOR TOWESTERN UNION TELEGRAPH COMPANY, OF NEW YORK, N. Y. IMPROVEMENT IN DUPLEX TELEGRAPHS. Specification forming part of Letters Patent No. 217,782, dated July 22, 1879 ; application filed November 14,1878. To all whom…

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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