DE FoREST VALVES 9} Made by the Man who invented Broadcasting 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 labora- tories of Dr: Lee De Forest; inventor of the first radio valve: Write for descriptive Leafiets. INTERNA TIONAL RADIO CO. Ltd. 22 BLAIR STREET, WELLINGTON Factory Ageeta.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310206.2.37.1
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Radio Record, Volume IV, Issue 30, 6 February 1931, Page 12
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72Page 12 Advertisement 1 Radio Record, Volume IV, Issue 30, 6 February 1931, Page 12
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