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Technical advancements of the vestigial side band technique allowed for the opportunity to increase the image resolution.The NTSC selected 525 scan lines as a compromise between RCA's 441-scan line standard (already being used by RCA's NBC TV network) and Philco's and Du Mont's desire to increase the number of scan lines to between 605 and 800.
However, some of these lines may now contain other data such as closed captioning and vertical interval timecode (VITC).
The first publicly announced network television broadcast of a program using the NTSC "compatible color" system was an episode of NBC's Kukla, Fran and Ollie on August 30, 1953, although it was viewable in color only at the network's headquarters.
The first nationwide viewing of NTSC color came on the following January 1 with the coast-to-coast broadcast of the Tournament of Roses Parade, viewable on prototype color receivers at special presentations across the country.
The first color NTSC television camera was the RCA TK-40, used for experimental broadcasts in 1953; an improved version, the TK-40A, introduced in March 1954, was the first commercially available color television camera.
Later that year, the improved TK-41 became the standard camera used throughout much of the 1960s.