MODEL RELEASED. Lee De Forest (1873-1961),an American inventor,who in 1906 invented the first vacuum tube known as the Audion,which amplifies weak electrical signals. De Forest was a pioneer in the field of electronics,with over 180 patents to his credit | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / New York Public Library |
Taille de l’image : | 3660 px × 3065 px |
Model Release : | Disponible |
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