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First Electric Hearing Aid (1 jan 1898 ano – 1 dez 1898 ano)

Descrição:

Miller Reese Hutchison creates the first electric hearing aid called the akouphone. It used a carbon transmitter in order to make the device portable. This hearing aid would amplify weak signals into strong signals using electrical currents.

Adicionado na linha do tempo:

A Brief History of the Hearing Aid

ByBrenda Perez
28 out 2019
0
0
201

Data:

1 jan 1898 ano
1 dez 1898 ano
~ 11 months

Imagens:

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