Page last updated at 06:01 GMT, Tuesday, 2 February 2010

World War II computer Colossus that cracked Nazi code

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Retired British spy catcher Tony Sale rebuilt Colossus, the world's first recognisably programmable computer.

Colossus was instrumental in the work of code cracking operations at Bletchley Park in Buckinghamshire during World War II.

It deciphered messages sent by German over the Lorenz Cipher.

Colossus was kept as a state secret until the end of the 1990s.

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