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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 667

An illustration from Collection of United States patents granted to Thomas A. Edison, 1869-1884, 1869, leaf 667
ng to pulsate thecurrent on the line, a key to shunt the mainline and prevent the action therein of thepul-sator, and three receiving-instruments in thebridge, one operated by reversal of current,the other by changes in the strength of tbe cur-rent, and the third by the pulsations of thecurrent,… … United States Patent Office, THOMAS A. EDISON, OF MENLO PAKK, NEW JERSEY, 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 NoArember 14, 1878. To all…

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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