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I think years ago (maybe 1930s or 1940s) the AM band used to go from 510 to 1525 or thereabouts, and then in the 1950s I think it went to 540-1650 and then I think the 1980s was when it went to 530-1710, and I think for a while in the late 1930s and early 1940s the AM band went from 540-1710 (1650-1710 was the old Police band and that was often times included on some of the higher end AM only radios.)
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