How Sony's Walkman Changed the World — adweek.com

Andreas Pavel was getting tired of being laughed at. It was 1977, and the German-born inventor had made appointments at all of the major electronics companies—Yamaha, Grundig, ITT, etc.—and each had sent him packing. Pavel was trying to interest them in a device he'd invented called the "Stereobelt," a portable cassette player equipped with headphones. It was a novel invention, but the big brands were having none of it.

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