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Imperial War Museums on Twitter: "In this unique footage filmed shortly before the Dambusters' Raid in May 1943, an Avro Lancaster flies low off the Kent coast, trialling a cylinder-type "Upkeep" bouncing
![Amazon.com: Ultimate Dambusters Collection, The : Stephen Fry, Cy Chadwick, Christopher Purcell, Air Commodore H.I. Cozens CB, AFC, RAF: Movies & TV Amazon.com: Ultimate Dambusters Collection, The : Stephen Fry, Cy Chadwick, Christopher Purcell, Air Commodore H.I. Cozens CB, AFC, RAF: Movies & TV](https://m.media-amazon.com/images/I/51uX4AwMLTL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Ultimate Dambusters Collection, The : Stephen Fry, Cy Chadwick, Christopher Purcell, Air Commodore H.I. Cozens CB, AFC, RAF: Movies & TV
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