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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / New York Public Library |
Bildgröße: | 3171 px × 3436 px |
Modell-Rechte: | vorhanden |
Restrictions: |
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