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 1347
a magnetic port ion of thin sheet-iron ringsseparated by insulation, elaraping-plates, andclamping-bolts insulated both from the clamp-ing-plates and from the thin sheet-iron rings,the parts being constructed, arranged, andcombined substantially as set forth. This specification signed and witnessed… … WITNESSES:
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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