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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 595

An illustration from Collection of United States patents granted to Thomas A. Edison, 1869-1884, 1869, leaf 595
s and for the purposes set forth. 8. In an instrument for transmitting and re-producing the human voice or other sound, aclosed telegraphic circuit containing a batteryand compressible elastic material operated bythe sound, for increasing and decreasing theresistance to the battery-current,… … .N.PETERS, PHOTO-UTHOGRAPHER, WASHINGTON, D C United States Patent Office. THOMAS A. EDISON, OF MENLO PAEK, NEW JEESEY, ASSIGNOE TO WESTEENUNION TELEGEAPH COMPANY, OF NEW YOEK, N. Y. IMPROVEMENT IN SPEAKING-TELEPHONES. Specification forming part of Lettei3 Patent No. 203,016, dated April 30, 1878;…

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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