Statistics for occurrence #1 of “Thomas A. Edison” in entry telephone-the of Harper's Encyclopedia of United States History:
...ical transmission and reproduction of articulate speech......July, 1874
Bell constructs an electrical telephone, with a diaphragm of gold-beater's skin, which transmits speech......July, 1875
Thomas A. Edison , furnished by William Orton, president of the Western Union Telegraph Company, with a description of Reis's telephone, begins experiments with a view to producing an articulating telephone......July,...
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