worked was not understood at the time. de forest's initial audions did not have a high vacuum and developed a blue glow at modest plate voltages; de forest improved the vacuum for federal telegraph. [ ] by , vacuum tube operation was understood, and regenerative circuits using high vacuum tubes were...
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manufacture of electrical equipment for engines and vehicles ( ) manufacture of electricity distribution and control apparatus ( ) manufacture of insulated wire and cable ( ) manufacture of lighting equipment and electric lamps ( ) manufacture of other electrical equipment ( ) manufacture of radio, television...
manufacture of electrical equipment for engines and vehicles ( ) manufacture of electricity distribution and control apparatus ( ) manufacture of insulated wire and cable ( ) manufacture of lighting equipment and electric lamps ( ) manufacture of other electrical equipment ( ) manufacture of radio, television...
manufacture of electrical equipment for engines and vehicles ( ) manufacture of electricity distribution and control apparatus ( ) manufacture of insulated wire and cable ( ) manufacture of lighting equipment and electric lamps ( ) manufacture of other electrical equipment ( ) manufacture of radio, television...
manufacture of electrical equipment for engines and vehicles ( ) manufacture of electricity distribution and control apparatus ( ) manufacture of insulated wire and cable ( ) manufacture of lighting equipment and electric lamps ( ) manufacture of other electrical equipment ( ) manufacture of radio, television...
manufacture of electrical equipment for engines and vehicles ( ) manufacture of electricity distribution and control apparatus ( ) manufacture of insulated wire and cable ( ) manufacture of lighting equipment and electric lamps ( ) manufacture of other electrical equipment ( ) manufacture of radio, television...
manufacture of electrical equipment for engines and vehicles ( ) manufacture of electricity distribution and control apparatus ( ) manufacture of insulated wire and cable ( ) manufacture of lighting equipment and electric lamps ( ) manufacture of other electrical equipment ( ) manufacture of radio, television...