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 625
fully 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 ?, arma-ture-lever i, and magnet m, in combinationwith the reversing-key r and circuit-connec-tions,… … United States Patent Office. THOMAS A. EDISON, OF NEWABK, NEW JERSEY.IMPROVEMENT IN DUPLEX TELEGRAPHS. Specification forming part of Letters Patent No. 207,721, dated September 3, 1878; application filed December 28, 1674. To all whom it may concern: Be it known that I, Thomas A. Edison, ofNewark,…
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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