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 547
sur-rounded with a wire helix, and included in atelegraphic circuit, substantially as set forth. 4. The combination of an electro-magnet,vibrating reed, sounding-box or resonator ofcorresponding pitch, and a local circuit-break-ing apparatus, actuated by the vibrations ofa column of air in said… … United States Patent Office. THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO THEWESTERN UNION TELEGRAPH COMPANY. IMPROVEMENT IN TELEPHONIC TELEGRAPHS. Specification forming part of Letters Patent No. 198,0§8, dated December 11, 1877; application filed April 6, 1876. To all whom 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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