Sony Walkman turns 30
The archival exhibit shows other Sony products that have been discontinued or lost out to competition over the years -- the Betamax video cassette recorder, the Trinitron TV, the Aibo dog-shaped robotic pet. The Walkman exhibit, which runs through Dec. 25 in Tokyo, shows models that are still on sale, some about the size of a lighter that play digital music files. AP Photo/Shuji Kajiyama
