11/01/1877 Batchelor, Charles, Kruesi, John and Edison, Thomas Alva -- Technical Notes and Drawings
(Carman, George E; Force, Martin N) Cylinder phonograph
[NS7703]  Notebook Series -- Unbound Notes and Drawings: (NS-77-003) Phonograph
[NS7703H; TAEM 7:455]
Courtesy of Thomas Edison National Historical Park.