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Harvey Fletcher - Wikipedia

    https://en.wikipedia.org/wiki/Harvey_Fletcher#:~:text=Harvey%20Fletcher%20%28September%2011%2C%201884%20%E2%80%93%20July%2023%2C,2-A%20audiometer%20and%20an%20early%20electronic%20hearing%20aid.
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Audiometers | Psychology Wiki | Fandom

    https://psychology.fandom.com/wiki/Audiometers
    The invention of this machine is generally credited to Dr. Harvey Fletcher of Brigham Young University. Audiometers are standard equipment at ENT clinics and in audiology centers. They usually consist of an embedded hardware unit connected to a pair of headphones and a feedback button, sometimes controlled by a standard PC.

Harvey Fletcher - Wikipedia

    https://en.wikipedia.org/wiki/Harvey_Fletcher
    Harvey Fletcher was an American physicist. Known as the "father of stereophonic sound", he is credited with the invention of the 2-A audiometer and an early electronic hearing aid. He was an investigator into the nature of speech and hearing, and made contributions in acoustics, electrical engineering, speech, medicine, music, atomic physics, sound pictures, and education.

Inventor Of The Hearing Aid – Innovation-Creativity

    https://www.innovation-creativity.com/inventor-of-the-hearing-aid/
    An American physicist, born on 11th July in the year 1884, who is also the inventor of the audiometer, Fletcher patented the first electrical hearing aid while working for Bell Laboratories. The documented history of the modern era gives several names who have had invented various types of hearing aids across the world through the nineteenth and twentieth century.

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