First Concept of the Hearing Aid (1 jan 1600 ano – 1 jan 1700 ano)

Descrição:

Jean Leurechon makes the first device to help people with Deafness and hard of hearing (no exact date of invention, just first seen in the 17th century). The first hearing aid was an "ear trumpet". People would place ir in the ear and the other person would talk into it and sound would be amplified.

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