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 399
ative as well when thekey e is open as when it is closed, and viceversa. I claim as my invention— The batteries Jc I o and circuits and circuit-closers of the electro-magnets b c d, in combi-nation with the electro-magnetic sounder orcall m and key e, the parts being adjusted tooperate… … AM.moro-irrmsHAP.HIC Com Y. (ossowse/tocessj United States Patent Office THOMAS A. EDISON, OP NEWAEK, NEW JEBSEY.IMPROVEMENT IN TELEGRAPH-RELAYS. Specification forming part of Letters Patent No. 150,846, dated May 12, 1874; application filed June 27,1873. Case 81, To all tvhom it may concern: Be it…
Trade catalogs · Patents · Edison, Thomas A. (Thomas Alva), 1847-1931 · Inventions · Telegraph · Electric machinery · Electric apparatus and appliances · Phonograph · Telephone · Motors
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-275-109.webp)
