A Useful Tip
A CARPHENTHR’S brace can be adapted to take a small wireless drill if necessary by winding a fairly stout wire around the drill in the form of a spiral spring, to enlarge its diameter. ~
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310130.2.18
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Radio Record, Volume IV, Issue 29, 30 January 1931, Page 5
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37A Useful Tip Radio Record, Volume IV, Issue 29, 30 January 1931, Page 5
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