Jacs wrote:
I should have put thank you to whoever came up with the idea of portable music players, as they have been a real live saver to me.
Oh yes, absolutely - they're a brilliant idea and my sanity has been saved by them more times than I can count.
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Who did invent them? I guess the first would have been the Sony Walkman?
Much,
much earlier than you'd think:

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The Radio Hat was a portable radio built into a pith helmet that would bring in stations within a 20 mile (32 km) radius. It was introduced in early 1949 for $7.95 as the "Man-from-Mars Radio Hat." Thanks to a successful publicity campaign, the Radio Hat was sold at stores from coast to coast in the United States.
Apparently it had a 20 hour battery life, which is probably around 19 hours and 59 minutes longer than the credibility of the wearer.
Technical details
here, should you feel like building one.
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Giraffe: a ruminant with a view.