I just learned the Sony Walkman just turned 30 years. In 1979 July 1, Sony released a portable cassette player to the market called the Walkman. It can only played recorded cassette tapes.It was a major leap in portability for consumer electronics. For the first time you can carry a entertainment appliance in your pocket.As a early tech adopter I bought one of the latter models. this can record to cassette and also has a AM/FM radio. It has a battery that is shaped like a piece of Chiclets chewing gum. I believe this battery is also rechargeable. However the short battery life between recharges causes my interest to wane and this cassette has since been shelved.Look out for the picture of a vintage Walkman cassette player/recorder, after I dug it out of my junk b...