DE FoRREST VALVES {( Made by the man who invented Broadcasting 99 The right selection of radio valves makes an amazing difference in the pleasure you get from radio. De Forest Audions have set the world standard for 24 years: They are made in the Jabora- tories of Dr; Lee De Forest; inventor of the first radio valve: Write for descriptive Leaflets- INTERNA TIONAL RADIO CO. Ltd. 22 BLAIR STREET, WELLINGTON Factory Agente:
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https://paperspast.natlib.govt.nz/periodicals/RADREC19301226.2.36.1
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Radio Record, Volume IV, Issue 24, 26 December 1930, Page 12
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72Page 12 Advertisement 1 Radio Record, Volume IV, Issue 24, 26 December 1930, Page 12
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