The Auris carbon microphone hearing aid made by the General Acoustic Co. and available by 1911, was said to be the smallest and least expensive model on the market. In the 1920s, the Auris was described as “Science’s New Gift to the Deaf” perfected by radio engineers. This Auris Model II was donated to the Smithsonian in 1939.
Ref: Auris ad in New York Times (March 31, 1911), p. 4.
Auris ad in Chicago Tribune (Jan. 12, 1912), p. B6.
Auris ad in New York Times (Oct. 5, 1924), p. SM15.
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