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I don't know the earliest production. I assume that version or one like it, was produced to equip their color TV repair dealerships for '54. I've never seen or heard of any earlier version of the color bar generator, so I'd guess that's the earliest basic model; maybe with a few updates between '54 and whenever they went to the next generation Chro-Bar II.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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