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 401
ative as well when thekey e is open as when it is closed, and viceversa. I claim as my invention— The batteries 7c I o and circuits and circuit-closers of the electro-mag nets bed, in combi-nation with the electro-magnetic sounder orcall m and key e, the parts being adjusted tooperate substantially… … United States Patent Office THOMAS A. EDISON, OF NEWARK, NEW JERSEY.IMPROVEMENT IN TELEGRAPH-RELAYS. Specification forming part of Letters Patent No. 150, §46, dated May 12, 1874; application filed June 27,1873. Case 81. To all idiom it may concern: Be it known that I, Thomas A. Edison, ofNewark,…
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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