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Douglas Hillman developed the WankelBee helicopter with rotary combustion engine (first flown 1975) and two-seat Hornet (first flown 1978).
1980: Hillman Helicopters Inc., Box 1411, Scottsdale, AZ 85252, USA.
Hillman Helicopter designed Model 360 as three-seat utility helicopter of very modern design which first flew 1981.

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