Red Bull reveal their title defender

Red Bull have launched the car with which they hope to win their fourth successive championship double this season. The Renault-powered RB9 was unveiled at the team's UK factory in Milton Keynes on Sunday. The Adrian Newey-designed machine, the ninth Formula One car produced by Red Bull, will be raced by the squad's unchanged driver line up of world champion Sebastian Vettel and team mate Mark Webber

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