R.F. and Detector Stages of Browning-Drake showing adaptation of Shield Grid Valve
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280420.2.40.1.1
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Radio Record, Volume I, Issue 40, 20 April 1928, Page 12
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12R.F. and Detector Stages of Browning-Drake showing adaptation of Shield Grid Valve Radio Record, Volume I, Issue 40, 20 April 1928, Page 12
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