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File:Alexander Graham Bell's Telephone Patent Drawing and Oath - NARA - 302052 (page 2).jpg

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    English: Alexander Graham Bell's Telephone Patent Drawing, 03/07/1876. Bell's telephone was the first apparatus to transmit human speech via machine. His work culminated in one of the most profitable and contested of all 19th-century patents. From the National Archives. The Patent Number is US174465.
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    This media is available in the holdings of the National Archives and Records Administration, cataloged under the National Archives Identifier (NAID) 302052.

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    Author Alexander Graham Bell
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