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Or how about how many gave up when radio and tv started going to solid state?
I'd bet the switch to color had a much slower impact, since it didn't explode in sales very quickly like b/w TV did. Of course it's not like color tv wiped all repair-needing b/w tvs out of peoples houses, nor did b/w tvs eliminate everybody's broken radios that needed fixing. However I can see where if you decided you were only going to fix radios or b/w tvs, you would start to lose existing customers to someone who could service the things that you couldn't.
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