insolence
发表于 2025-3-30 10:12:46
Alfred L. Horowitz MDow scientific technical standards are derived and integratedThe life-long inventor, Lee de Forest invented the three-element vacuum tube used between 1906 and 1916 as a detector, amplifier, and oscillator of radio waves. Beginning in 1918 he began to develop a light valve, a device for writing and r
因无茶而冷淡
发表于 2025-3-30 14:53:05
Alfred L. Horowitz MDdio waves. Beginning in 1918 he began to develop a light valve, a device for writing and reading sound using light patterns. While he received many patents for his process, he was initially ignored by the film industry. In order to promote and demonstrate his process he made several hundred sound sh
按时间顺序
发表于 2025-3-30 16:35:53
ow scientific technical standards are derived and integratedThe life-long inventor, Lee de Forest invented the three-element vacuum tube used between 1906 and 1916 as a detector, amplifier, and oscillator of radio waves. Beginning in 1918 he began to develop a light valve, a device for writing and r