Sony's first truly portable cassette player, the Walkman, was originally developed for a company chairman who wanted to be able to listen to music on long plane rides. He was impressed, and less than a year later, the revolutionary device hit the market. Sales soon exploded, cementing the Walkman's place in pop culture. It remained popular throughout the 1990s, before CDs and mp3s supplanted cassettes. Who invented the portable personal stereo cassette player years before the Walkman's debut?
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