De Forest:american electrical engineer who patented the triode electron tube (1907) that made possible the amplification and detection of radio waves. He originated radio news broadcasts in 1916.
英
美
- "德福雷斯特:美國電力工程師；獲三極電子管的發(fā)明專(zhuān)利(1907年)；該發(fā)明使無(wú)線(xiàn)電波的增幅和檢波成為可能.；1916年他首創(chuàng )無(wú)線(xiàn)電新聞廣播
