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All of the above, I think.
The system was demonstrated in May 1950, and was eventually rejected (along with the RCA system) in favor of the CBS field sequential system. The Condon Committee report to the Senate stated that the picture quality was poor and was marred by serious line crawl even at low illumination levels.
The later record of the second NTSC indicates that no numerical data was available to calculate the severity of the line crawl or the factors that would affect it.
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