AN AMAZING INVENTION! The Radio SA" Battery j8 a constant source 0f dificulty , especially to those who cennot conveniently get accumulators charged: The new AIR CELL, invented by the Columbia Battery Firm, will operate a 4-valve Bet; equipped with the new 230 Or similar 2-volt valves, from 18 monthg to 2 years Without renewal Or recharging: Just think what thie meang ! One "A" Battery lasting longer than two sets 0f "B" batteries Price 0f the AIR CELL is. �8/18/- AT LAST 'ROUBLE FREE BATTFRY RADIO. Obtainable only from JOHNC LTD: OHANCERY ST,, AUCKLAND.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310424.2.42.1
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Radio Record, Volume IV, Issue 41, 24 April 1931, Page 13
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93Page 13 Advertisement 1 Radio Record, Volume IV, Issue 41, 24 April 1931, Page 13
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