Walkman………….
Walkman is a sony tradename that use for portable audio cassette,but now Walkman used for Sony‘s portable audio and video players as well as a line of Sony Ericsson mobile phones .Althogh ,the original walkman introduced for people to listen music while carry music with them .
It was built in 1978 by Nobutoshi Kihara for Sony .But it was marketed in 1979 as the walkman in Japan
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