11/05/1874 [Supplied month] Johnson, Edward Hibberd to Barker, George Frederick
(Automatic Telegraph Co; Edison, Thomas Alva) Expositions, demonstrations, lectures; Electromotograph
[X107]  University of Pennsylvania Archives, Philadelphia, Pa.: George F. Barker Papers
[X107AA; TAEM 0:0]
Courtesy of the University of Pennsylvania Archives.