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The "Color Phase Alternation" system tested by RCA-Hazeltine operated at the field rate causing lots of large area flicker. Loughlin got a US patent on it, #2,943,142 granted finally on June 28, 1960, having been filed for on January 22, 1951. More about this is in the George H. Brown book, "And Part of which I Was", Recollections of a Research Engineer, pages 238-239.
Cliff
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