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Because they did not. FM then in the USA wasn't yet mainstream enough. And many areas had few or no FM stations for many miles outside of big Northern USA cities. The first USA made portable radio was the 1962 Zenith Royal 2000 Trans-Symphony, which was transistor. In 1962, in Eastern Tennessee, there was fewer than 10 FM stations from Bristol, TN to Chattanooga, TN on the entire USA FM band. Very few cars had FM sets either.
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