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Short wave radio EVOLVED. The lower wavelengths below 300Meters- were assigned to amateurs, as the commercial stations thought they were worthless... around the teens or after World War I.=( the 200Meter wavelength was used by Tramp steamers, though) Amateur experimentation indeed opened up horizons in this field from when radio amateurs first came out legally ( around l9ll in the US) onwards, so the discoveries were made more or less accidentally poking around with the assigned lower frequencies and improving on coils, tubes, antennae, etc.
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