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The world's first commercially produced transistor radio.
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Was introduced by Raytheon. It was a larger portable radio, including an expansive four-inch speaker and four additional transistors.
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Tokyo Tsushin Kogyo (now called Sony), launched its product of its kind with five transistors.
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The stereobelt was the first portable personal stereo audio cassette player.
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Were introduced commercially by various companies in the late 1970's, when stereo capabilities were added to existing designs of the radio-cassette recorder.
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Walkman is a Sony brand tradename originally used for portable audio cassette.
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The Discman was the product name given to Sony's first portable CD player.
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Was announced by Sony as a magneto-optical disc-based data storage device initially intended for storage.
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