MODEL RELEASED. Lee De Forest (1873-1961),seated at his invention,the radio-telephone,called the audion,a vacuum tube that takes weak electrical signals and amplifies them. Lee De Forest was a prolific American inventor,who was granted over 180 patents,and is credited with helping bring sound to movies | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / New York Public Library |
Bildgröße: | 2934 px × 3774 px |
Modell-Rechte: | vorhanden |
Restrictions: |
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