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20 Kilo Watt Tube to Revolutionize Radio Dr Irving Langmuir the American chemist , holding the new 20 kilowatt Vacuum Tube . It is said that this tube will replace the mommoth alternators now used , and it is five times as large as any used outside America 1 August 1922 , 20 Kilo Watt Tube to Revolutionize Radio Dr Irving Langmuir the American chemist , holding the new 20 kilowatt Vacuum Tube . It is said that this tube will replace the mommoth alternators now used , and it is five times as large as any used outside America 1 August 1922

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