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hearing aids. (1 Jan 1920 Jahr – 1 Jan 0 Jahr)

Beschreibung:

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 Okt 2018

3

0

928

Datum:

1 Jan 1920 Jahr

1 Jan 0 Jahr

~ 10 years

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