The first man to find a reliable method of forecasting reception conditions, particularly with regard to the shorter waves, will be doing what 3s probably the greatest service since De Vorest added the grid to the valve.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280622.2.17
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Radio Record, Volume I, Issue 49, 22 June 1928, Page 3
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37Untitled Radio Record, Volume I, Issue 49, 22 June 1928, Page 3
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