THE International Consultative Committee of the Technique of Radio Electric Communications has classified wireless waves as follbws:-Long, 3000 and upwards; medium, 200 to 8000; intermediate, 50 to 200; short, 10 to 50; ultra-short, below © 10. affect the weather!
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300131.2.24
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Radio Record, Volume III, Issue 29, 31 January 1930, Page 7
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38Untitled Radio Record, Volume III, Issue 29, 31 January 1930, Page 7
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