The first ever headphone concept. Circa 1898. The instrument was able to absorb sound from the environment amply it back to the user. So in 19 th century London it was completely useless. But hey we got the hang of it eventually
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The first ever headphone concept. Circa 1898. The instrument was able to absorb sound from the environment amply it back to the user. So in 19 th century London it was completely useless. But hey we got the hang of it eventually

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