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English Heritage has splashed out £500,000 to rescue three huge concrete 'listening ears'built in the 1920s.The crumbling scheduled monuments at Greatstone on the Kent coast - two bowls and a 61m acoustic wall - were the forerunners to radar that helped win the Battle of Britain.The 'mirror' that focused sound is one of only two in the world. The Royal Society for the Protection of Birds hopes to eventually manage the site as a nature reserve.

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