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 631
described in another applicationof even date herewith, and designated as Case99. I claim as my invention— The differential polarized relay-magnet g hand local circuit containing the key I, arma-ture-lever % and magnet m, in combinationwith the reversing-key r and circuit-connec-tions, substantially… … N PETERS. Photo-Lithographer. Washington. D. C United States Patent Office. THOMAS A. EDISON, OF NEWARK, NEW JERSEY. IMPROVEMENT IN DUPLEX TELEGRAPHS. Specification formiug part of Letters Patent No. %07i¥24, dated September 3, 1878; application filed December 28, 1874. To all wTiom it may concern:…
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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