DE FoREST VALVES Made by the mai who invented Broadcasting The right selection of radio valves makes an amazing difference in the pleasure you get rom radio. De Forest Audions have get the world standard for 24 year8: They are made in the labora- tories of Dr: Lee De Forest;" inventor of the first radio valve: Write for descriptive Leaflets. INTERNA TIONAL RADIO CO. Ltd. 32 BLAIR STREET, WELLINGTON . Factory Agento:
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310306.2.9.1
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Radio Record, Volume IV, Issue 34, 6 March 1931, Page 2
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71Page 2 Advertisement 1 Radio Record, Volume IV, Issue 34, 6 March 1931, Page 2
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