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hearing aids. (1 janv. 1920 – 1 janv. 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

854

Date:

1 janv. 1920

1 janv. 0

~ 10 years

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