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Hickok was one of a handfull of vendors who introduced NTSC color bar generators around 1955-56. Hickok made two models, the 656XC (pictured) and the 655XC.
Both machines produced dot and crosshatch patterns, as well as NTSC color bars (albeit in an unusual color sequence), but the 656XC also produced a R--Y and B-Y bar pattern, and the 655XC produced a I and Q bar pattern.
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John Folsom
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