A TYPICAL CALIBRATION CHART. The vertical divisions should be divided into units instead of 5's, as shown. The stations are fixed by horizontal and vertical lines.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310605.2.66.1
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Radio Record, Volume IV, Issue 47, 5 June 1931, Page 31
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26A TYPICAL CALIBRATION CHART. The vertical divisions should be divided into units instead of 5's, as shown. The stations are fixed by horizontal and vertical lines. Radio Record, Volume IV, Issue 47, 5 June 1931, Page 31
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