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hearing aids. (1 jan 1920 ano – 1 jan 0 ano)

Descrição:

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 out 2018

3

0

855

Data:

1 jan 1920 ano

1 jan 0 ano

~ 10 years

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