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by _delirium 5197 days ago
Color television would be my pick for that category. If you go by time of first commercial introduction, it had no uptake really: it came out in 1953, but expensive units with little programming available sold poorly in the 1950s. But once it started catching on around 1965, the transition was really fast, with nearly everyone having one by 1970. If you went by 7-year period with the biggest percentage delta, I think it would be in the running.