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"Thomas Edison created many inventions, but his favorite was the phonograph. While working on improvements to the telegraph and the telephone, Edison figured out a way to record sound on tinfoil-coated cylinders. In 1877, he created a machine with two needles: one for recording and one for playback. When Edison spoke into the mouthpiece, the sound vibrations of his voice would be indented onto the cylinder by the recording needle. What do you think were the first words that Edison spoke into the phonograph?"
http://www.americaslibrary.gov/cgi-bin/page.cgi/aa/edison/phonograph_1
So, it was invented in 1877.
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∙ 14y ago
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