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

Description:

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 Oct 2018

3

0

851

Date:

jan 1, 1920

jan 1, 0

~ 10 years

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