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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 305

An illustration from Collection of United States patents granted to Thomas A. Edison, 1869-1884, 1869, leaf 305
ubstantially as and for the pur-poses set forth. 2. Two relay-magnets in the main circuit,with armatures adjusted differently, in combi-nation with a local circuit effecting distinct anddifferent operations, according to the lengthof pause between pulsations in the main line,substantially as… … 2 Sheets--Sheet 2 T. A. EDISON.Printing Telegraphs. No. 140,487, Patented July 1, 1873.

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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