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The Telephone Patent Conspiracy of 1876: The Elisha Gray-Alexander Bell Controversy and Its Many Players (English Edition) eBook : Evenson, A. Edward: Amazon.de: Kindle-Shop
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Telephone & Light Patent Drawings | National Archives
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A diagram of Alexander Graham Bell's speaking telephone, patented March 19, 1878. | DPLA
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Alexander Graham Bell: The Invention of the Telephone
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History of the telephone - Wikipedia
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