Walkman

The Sony Walkman personal stereo was a transistorized miniature portable cassette tape player invented by Akio Morita, Masaru Ibuka, and Kozo Ohsone, manufactured by Sony Corporation. The first Sony Walkman stereo was sold in 1979. The name Walkman was invented by Akio Morita. A German inventor, Andreas Pavel, claimed that he had came up with a similar device called a Stereobelt back in 1977. After court battles, Pavel and Sony came to an out of court settlement in 1999.

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The names "Walkman", "Pressman", "Watchman", "Scoopman", and "Discman" are trademarks of Sony, and have been applied to a wide range of portable entertainment devices manufactured by the company. Sony continues to use the "Walkman" brand name for all of these kinds of portable audio devices as well, after the "Discman" name for CD players was dropped in the late 1990s.

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Transistor: The transistor is a solid state semiconductor device which can be used for amplification, switching, voltage stabilization, signal modulation and many other functions. It acts as a variable valve which, based on its input voltage, controls the current drawn by it from a connected voltage supply....

Cassette tape: REDIRECT Compact Cassette...

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