HD annual report of the British Comptroller-General of Patents shows that during 1938 there was special attention given to short-wave wireless research, especially for aerial navigation; cathode ray tubes for television and as oscillation generators, and photo-electric cell patents were also prominent.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19350308.2.44
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Radio Record, Volume VIII, Issue 35, 8 March 1935, Page 39
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42Untitled Radio Record, Volume VIII, Issue 35, 8 March 1935, Page 39
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