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1 gen 1923 anni - The first hearing Aid was invented

Descrizione:

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.

Aggiunto al nastro di tempo:

Decades project

ByThais Kearton
12 feb 2018

Data:

1 gen 1923 anni
Adesso
~ 101 years ago

Immagini:

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