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Nathanial Baldwin was the first inventor of headphones.
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German company Beyerdynamic invented and produced the first dynamic headphones, which are still in production today.
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john c koss, Millwaukee-based jazz musician ivented the fist stero headphones.
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The Koss esp/6 were the first electrostatic headphones produced.
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The 80's was a disaster for Koss as it deversified int other elctronics. The last contribution of the 70's was the HV line of lightweight headphones.
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Sony came out with walkman and made music mobile, and they were lightweight.