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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 607

An illustration from Collection of United States patents granted to Thomas A. Edison, 1869-1884, 1869, leaf 607
relay F, bellH, bat-tery K, and circuits, arranged and operatingsubstantially as herein set forth. 2. In combination with a telephonic and theprimary circuit of an induction-coil, the but-ton of lampblack carbon,prepared asset forth,and placed in the primary circuit,substantiallyas and for the… … United States Patent Office. THOMAS A. EDISON, OF MENLO PABK, NEW JERSEY, ASSIGNOR TO WESTERNUNION TELEGRAPH COMPANY, OF NEW lrORK, N. Y. IMPROVEMENT IN TELEPHONE CALL-SIGNALS. Specification forming part of Letters Patent No. 203,017, dated April 30,1878; application filed March 4, 1878. To all…

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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