09/04/1879 Johnson, Edward Hibberd to Edison Telephone Co of London Ltd
(Bell, Alexander Graham; Edison, Thomas Alva) Carbon, coal, glass, ceramics; Telephone
[D7941]  Document File Series -- 1879: (D-79-41) Telephone -- Foreign -- U.K. -- General
[D7941ZDU; TAEM 52:692]
Courtesy of Thomas Edison National Historical Park.