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 591
phragm and rheostat, of a localcircuit and an induction-coil, substantially asset forth. 4. In a speaking-telegraph, an induction-coil, a rheostat and a battery in a local cir-cuit, and a main-line circuit passing througha second induction-coil and also through thebattery, substantially as set… … MB ■1111 iffiill to
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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