WHEN ebonite ‘tubing has to be cg into short lengths for frame aerial supports, ete., the difficulty of holding it in the vice can be ovc.come by using a wooden block drilled to about the same diameter as the tube and then halved to form two shaped blocks, which can easily be held in the vice,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290118.2.27
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Radio Record, Volume II, Issue 27, 18 January 1929, Page 10
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56Untitled Radio Record, Volume II, Issue 27, 18 January 1929, Page 10
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