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==Technology== The Ceefax/ORACLE standard was internationalised in the 1980s as [[World System Teletext]], which was adopted into the international standard [[ITU-R|CCIR]] 653 (now [[ITU-R]] BT.653) of 1986 as CCIR Teletext System B. As with other [[teletext]] systems, text and simple graphics are transmitted in-band with the picture signal, and decoded by controller circuitry.
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