4 Free Photos of Elisha Gray And Alexander Bell Telephone Controversy

historyhistoricalalexander graham bellinvention of the telephone
Bell drawings of the production of vowel sounds, 1867
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P.D. Richards drawing of Bell experiments in early 1873
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Bell's drawing for Patent 161739 granted by U.S. PTO in April 1875
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Melville Bell's Drawing of Organic Formation of the Principal Elements of Speech
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