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Invented by Thomas Edison; Uses a needle on a record to make a sound.
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The first flat disc record was created by Emilie Berliner. The first records had poor sound quality.
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Patented by inventer Edwin H. Armstrong
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Developed by Lear Corporation
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Developed by Sony. Portable cassette player. Sold very well.
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Plastic Disc invented in 1980. Sold commercially in 1982. Coinvented by Phillips Electronics NV and Sony Corporation. Replaced the record.
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Tomislav Uzelac developed the first successful Mp3 player. Frauenhofer developed the first Mp3 player in the early 1990s but it didn't work.
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Developed by Apple inc. Portable media player. Very successful.