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According to a PBS show that I watched, RCA was not trying to kill off FM, just Armstrong's FM business.
They even designed the ratio detector to get around Armstrong patents. However, this did not work forever as the US Supreme court ruled that they and most other companys violated his patents and had to pay his widow (he had committed suicide-partly because of his fight with RCA) quite a sum of money.
The only major manufacturer that I am aware of that did not violate his patents was Zenith. I have great respect for the leaders of that corporation at that time. I have only disgust for the leaders of the other electronic companies, especially RCA. Sarnoff was truly what FDR had in mind when he said that most business leaders were "Atilla the Huns in suits".
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