NBC affiliate, WTMJ-TV channel 4 in Milwaukee from which I hale from 1946 through 1980, used RCA film chain equipment. The station was the third in the nation to originate local live color telecasting.
These two articles may be of interest.
https://visions4netjournal.com/wp-co...F-part-one.pdf
https://visions4netjournal.com/wp-co...F-Part-Two.pdf