02/03/1876 Serrell, Lemuel Wright to U.S. Patent Office. Commissioner and Duell, Rodolphus Holland
(Smith, Gerritt; Edison, Thomas Alva) Patent application; Multiple telegraphy (duplex, quadruplex)
[W100BA]  National Archives, Washington, D.C.: Records of the Patent and Trademark Office (Record Group 241) -- Patent Application Files
[W100BA2D; TAEM 0:0]