Figure 2.—A needle resting in one of the grooves. Note the comparative size. The groove shows white.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300228.2.81.1.2
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Radio Record, Volume III, Issue 33, 28 February 1930, Page 34
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17Figure 2.—A needle resting in one of the grooves. Note the comparative size. The groove shows white. Radio Record, Volume III, Issue 33, 28 February 1930, Page 34
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