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Alexander Graham Bell's audio signature (0:59) 

April 30 - Nine years after he placed the first telephone call, Alexander Graham Bell recorded his voice on a wax-covered cardboard disc on April 15, 1885, and gave it an audio signature: ''Hear my voice -- Alexander Graham Bell.'' The flimsy disc was silent for 128 years as part of the Smithsonian Museum's collection of early recorded sound, until digital imaging, computer science, a hand-written transcript and a bit of archival detective work confirmed it as the only known recording of Bell's voice. Photos courtesy of Smithsonian’s National Museum of American History.

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