08/07/1879 Edison, Thomas Alva -- Patents -- Caveats
(Batchelor, Charles; Serrell, Lemuel Wright; Griffin, Stockton L) Telephone
[W100ABL]  National Archives, Washington, D.C.: Records of the Patent and Trademark Office (Record Group 241) -- Caveats -- Telephones [case 90]
[W100ABL; TAEM 0:0]
Courtesy of the National Archives.