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 300 patents to his credit | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Science Source |
Bildgröße: | 2015 px × 2641 px |
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Eigentums-Rechte: | nicht erforderlich |
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