GCREENED-GRID valves are being employed in the latest type of receiver installed by the Royal Navy.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19281012.2.61
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Radio Record, Volume II, Issue 13, 12 October 1928, Page 29
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16Untitled Radio Record, Volume II, Issue 13, 12 October 1928, Page 29
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