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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 339

An illustration from Collection of United States patents granted to Thomas A. Edison, 1869-1884, 1869, leaf 339
o polarized electro-magnets in a maincircuit, in combination with two local circuit-connections to the magnets of a printing instru-ment, and a mechanism for opening and clos-ing the main circuit aud reversing the polar-ity of the current, substantially as and for thepurposes set forth. Signed by… … United States Patent Office. THOMAS A. EDISON, OF NEWAEK, NEW JEESEY.IMPROVEMENT IN CIRCUITS FOR AUTOMATIC OR CHEMICAL TELEGRAPHS. Specification forming part of Letters Patent No. 141,772, dated August 12,1873; application filed November 9,1872. To all whom it may concern: Be it known that I,…

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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