ExtraVision, an over-the-air teletext service of CBS Television, was the culmination of five years of effort by the Columbia Broadcasting System.
     It was launched in early 1984 using Antiope technology. CBS had tested both Ceefax and Antiope systems at affiliates including KMOX in St. Louis and KNXT in Los Angeles as early as 1979, but it was held up in going public by the Federal Communications Commission's initial refusal to approval over-the-air teletext broadcasting.
     Before launching ExtraVision, CBS also contracted with a Los Angeles independent, KCET, to develop and test children's educational programming.
     ExtraVision tried to be a sort of national electronic magazine carrying classified ads, airplane timetables, shopping information, news and weather, using Samsung decoders.
     It closed in 1988.

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