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RETMA figures show that 116,000 table model TV sets were made in 1947. RCA was the largest manufacturer - I would guess they were responsible for 30-50% of the sets. The 630 was still being made and sold. Assume that half of RCA's table model sets were 630 and half were 721s, that would translate into 17,000 to 29,000 721s.
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