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hearing aids. (1 gen 1920 anni – 1 gen 0 anni)

Descrizione:

in 1923 Miller Reese Hutchison made the Vacuum tube hearing aids. To make people that can't hear, hear

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ByNicholas Collins

1 ott 2018

3

0

851

Data:

1 gen 1920 anni

1 gen 0 anni

~ 10 years

Immagini:

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