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In page De Havilland Mosquito:

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Three prototypes were built, each with a different configuration. The first to fly was W4050 on 25 November 1940, followed by the fighter W4052 on 15 May 1941 and the photo-reconnaissance prototype W4051 on 10 June 1941. W4051 later flew operationally with 1 Photographic Reconnaissance Unit (1 PRU).[citation needed]