The relative outputs of familiar power-valves.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290920.2.26.2
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Radio Record, Volume III, Issue 10, 20 September 1929, Page 11
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6The relative outputs of familiar power-valves. Radio Record, Volume III, Issue 10, 20 September 1929, Page 11
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