Results for « 德 福雷斯特 ， 李 » (cmn)
10927424-n
德 福雷斯特 ， 李, 德福雷斯特，李
De Forest, Lee De Forest, Father of Radio
     United States electrical engineer who in 1907 patented the first triode vacuum tube, which made it possible to detect and amplify radio waves (1873-1961)
 

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