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I haven't researched it, but my guess is that DuMont was a poor businessman. His sets from the late 40s and early 50s were much better made that his competitors. But the pictures were not any better than say a 630. In a way, they were over-engineered, and as a result they cost much more to make. Customers weren't willing to pay more for his sets, so he probably lost money on them, or, at least, his profit margin was too low to support his business.
Also, he wasn't successful in establishing a dealer network like RCA, Philco, etc., who already had hundreds of radio dealers.
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