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The Eastern XTBM-4 Avenger was the designation given to three prototypes of an improved version of the Avenger that were produced in 1945. The XTBM-4 had a stronger wing and an improved wing folding mechanism, and was ordered into production as the TBM-4 for the US Navy and the Avenger IV for the Fleet Air Arm. The first prototype was completed before the end of the war, but production was cancelled before it began, and the remaining two prototypes were the only other aircraft built.