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The Sony Corporation invented the first portable music player.
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Cell Phones were invented earlier in the 20th century, but they became available to the public in the 1980's.
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While PC's were invented in the 70's, this specific IBM PC revolutionized hardware and software. It was developed by a team led by Don Estridge.
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The CD, invented by Jack Russell, made listening to music effortless. It's easy to use and doesn't experience wear and tear like cassettes would.
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Apple released the Mac, which was known for its ease of use, from the GUI operating system to the mouse. Invented by Steve Jobs.