The inventor of the Walkman, for instance, has been eclipsed in portable music players by Apple Computer's iPod.

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Portable computer tablets, such as Apple's upcoming iPad, are also part of the equipment of a paperless office.

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Apple Corps, which was created by The Beatles in 1968, took on Apple Computer in the High Court in September 2003 over claims that the computer maker's iPod portable player and iTunes Music Store violated its trademark agreement to steer clear of the music business.

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