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hearing aids. (1 янв 1920 г. – 1 янв 0 г.)

Описание:

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 окт 2018

3

0

855

Дата:

1 янв 1920 г.

1 янв 0 г.

~ 10 years

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