Which was the first electric hearing aid and by whom was it patented?
first HEARING AID
`Acousticon’ was the first HEARING AID (Electric) patented by Miller Reese Hutchinson of New York, on 15 November 1901.
Which was the first electric hearing aid and by whom was it patented? General Knowledge for Kids and Students of Class 7, 8, 9, 10, 12 Examinations
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