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I have a Zenith floor model radio (8H061) with both old and new FM bands, marked FM40 and FM100. It is a 1946 model - which under normal conditions would have been fall of 1945. But I think the '46 models were not out until mid '46 due to World War II
In this area (North central NY state), two FM stations were on the air by 1940. I do not know when they moved to the current band - I think it was requred by 1948.
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