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Alan Cross penned a piece for the Saturday Star that's finally online. It's about the history of car radios, how they came to be in your vehicle in the first place and the remarkable way one inventor got people to notice.
Turn the radio up
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According to Wikipedia, Crossley Motors offered a factory fitted car radio in 1933. The mid 1930's also saw the introduction of push button AM radios. An FM option was available from Blaupunkt in 1952.