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18 h 8 m, 31 dez 1902 ano - Lee De Forest inventa el bulbo o valvula de vacio.

Adicionado na linha do tempo:

Inteligencia Artificial

ByJuan L. Lawliet
8 fev 2018

Data:

18 h 8 m, 31 dez 1902 ano
Agora
~ 121 years ago
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