Sony unveils its twin-screen tabletA split from the norm: Sony unveils its twin-screen tablet that opens like a book - but will it take a bite out of Apple?
* Sony will also produce a conventional tablet as it aims to break the market
* S1 and S2 will use Google's Android 3.0 operating system
* Tablets will both be wi-fi and 3G/4G compatible
* Prices and release dates not revealed
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