NEVER try and drill a hole in ebonite unless the exact position has been punched in, otherwise the drill is bound to wander. 5 HEN flash-lamp bulbs are recommended for use as fuses in radio sets, the kind meant are the low consumption type of bulb.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290328.2.32
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Radio Record, Volume II, Issue 37, 28 March 1929, Page 8
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46Untitled Radio Record, Volume II, Issue 37, 28 March 1929, Page 8
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