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The very first headphones were invented in 1890 in Britain. They were connected to a switchboard which would brodcast performances from across London.
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Nathaniel Baldwin invented the first modern headphones in his kitchen. He sold them to the U.S Navy. He didn't patent them however, because he was an idiot.
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The DT-48’s from Beyerdynamic are the first dynamic headphones to be sold to the public.
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At a show in Tokyo, Stax debuted the first electrostatic headphones. They are extremly rare now.
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These were the first U.S made stereo headphones. They weighed 2 pounds. Not nearly as light as current headphones.
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Along with Sony dropping the Walkman came Sony's MDL- 312 headphones. They were the first portable headphones.
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The earbuds were invented in 1980 but wouldn't become all that popular untill Steve Jobs made them mainstream.
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These headphones didn't need to be connected with a wire. They became immensily popular and expensive.