03/07/1878 Edison, Thomas Alva to Bentley, Henry
(Society of Telegraph Engineers (London); Gold and Stock Telegraph Co; Orton, William [supplied or conjectured]) Telephone
[X001A1]  Henry Ford Museum and Greenfield Village Research Center, Dearborn, Mich.: Edison Papers and Related Items -- Series I: Manuscripts -- Thomas Alva Edison Correspondence (1862-1885)
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Courtesy of the Henry Ford Museum and Greenfield Village Research Center.