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1 Jan 1923 Jahr - The first hearing Aid was invented

Beschreibung:

Cupping one's hand over one's ear increases one's hearing ability by 5%. But thanks to the invention of the hearing aid by he Marconi Company, but in weighed 7kg.

Zugefügt zum Band der Zeit:

Decades project

ByThais Kearton
12 Feb 2018

Datum:

1 Jan 1923 Jahr
Jetzt
~ 101 years ago

Abbildungen:

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