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1 janv. 1923 - The first hearing Aid was invented

Description:

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.

Ajouté au bande de temps:

Decades project

ByThais Kearton
12 févr. 2018

Date:

1 janv. 1923
Maintenaint
~ Il y a 101 ans

Les images:

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