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junctions to detect radio waves, [ ] when he patented the radio crystal detector in . [ ] [ ] world war i accelerated the development of radio for military communications . after the war, commercial radio am broadcasting began in the s and became an important mass medium for entertainment and news....
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, talking motion pictures , practical audio recording , radar , television , and the first computers . for years virtually all consumer electronic devices used vacuum tubes. early tube amplifiers often had positive feedback ( regeneration ), which could increase gain but also make the amplifier unstable...
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