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 413
primary circuit operated by the trans-mitting-instrument, and an induction-relaycoil to act in the receiving-instrument by asecondary circuit, substantially as set forth. Signed by me this 12th day of December,1872^ THOMAS A. EDISON. Witnesses: Geo. T. Pinckney,Cilas. H. Smith. \ * T. A. EDISON. 2… … i 2 Sheets--Sheet 2. T. A. EDISON.Automatic Telegraphy and Perforators Therefor. No.151,209. V■ Cricked cjio^/^^d^ f Patented May 26^1874.
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-graphophonepaten15unit-1027-534.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-809-549.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-346-156.webp)
