Quote:
Originally Posted by Electronic M
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Prior to CBS color becoming standardized Zenith was one of the big players in the medical closed circuit color market. Before CBS color was on air there was a sizable closed circuit field sequential network between hospitals and medical schools to make surgical procedure education easier. I don't remember reading much about the replacement of that equipment with NTSC, but I would assume since it was costly and had a decent install base that it persisted into the NTSC era and that if any new recievers were needed after the 15G came on the market that engineers would have been tempted to use it. I'd bet you a cookie the last field sequential recievers receiving actual program material in the 50s were medical CC monitors...
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SKF converted to NTSC in 1956:
https://www.earlytelevision.org/skf_mackenzie.html
More:
https://www.earlytelevision.org/skf_color.html