Lee de Forest, Ph.D., from whose researches two decades ago modern radio evolved.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310724.2.8.1
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Radio Record, Volume V, Issue 2, 24 July 1931, Page 3
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13Lee de Forest, Ph.D., from whose researches two decades ago modern radio evolved. Radio Record, Volume V, Issue 2, 24 July 1931, Page 3
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