• Until the 1950s, people used headphones almost exclusively for radio communication.
• In 1958, John C. Koss introduced the Koss SP3 Steroephones along with a portable phonograph to patients in Milwaukee hospitals that proved revolutionary because their sound quality made them optimal for listening to music.
• 1979: The Sony "Walkman" created a need for a portable headphone and a lightweight set of MDR-3L2 headphones was included with the portable cassette player.
• In 1978, Dr. Amar Bose, while on a flight, tried an early set of electronic headphones used for passenger entertainment. But the cabin noise made it impossible to hear anything. He returned to Boston and investigated how ambient noise could be reduced with active noise cancellation.
• In 1989, the Noise Reduction Technology Group introduced the first noise-reduction headset, designed for the aviation industry.

In 1910, Nathaniel Baldwin invented headphones. A prototype was sent to Lt. Comdr. A. J. Hepburn of the U.S. Navy. Hepburn tested the device and found it worked unexpectedly well to transmit sound.

The Navy began to ask for more headphones from Baldwin, who could only mana...