Invention of the Phonograph
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Thomas Alva Edison conceived the principle of recording and reproducing sound between May and July 1877 as a byproduct of his efforts to "play back" recorded telegraph messages and to automate speech sounds for transmission by telephone.

The result was this invention, the Phonograph.
Added on Oct 14, 2011 by bryan
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Time: 02:28 | Views: 249 | Comments: 0
  phonograph,  invention,  Thomas  Edison,  telegraph,  telephone,  recording  sound,  playback,  hearing,  audio,  signal 
  1910s   Technology  
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