In 1970 Hughes Tool was reorganized as Summa Corp., and new subsidiary formed as Hughes Helicopters. This continued Models 269/200/300 and TH-55A piston-engined machines, OH-6 Cayuse Army observation, derived Models 500/530/Defender and prototype YAH-64 Apache attack helicopter (30 September 1975). AH-64 beat its rival and continues with other helicopters in production by MDHC (McDonnell Douglas Helicopters).

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