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Back in 1941 TV was 441 lines 30 frames sec/60 fields sec/ interlaced, with AM sound. Which must have sounded awful. Then WW2 happened. Japan, which according to the history I was taught in school did not exist before Dec 1941, attacked Pearl Harbour and with Germany WW2 was on, and no consumer electronics was made for a few years. Afterwards the FCC decided to make it 525 lines, and make sound FM, to Sarnoff's great joy...
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