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accidents; 88 were destroyed (42%) and 37 (11%) of the 331 people involved were killed. The commonest cause of civil helicopter aerial accidents between 1975 and 1977 was striking wires and poles.Bristol Aerospace developed a WSPS qualified for the Bell OH-58 Kiowa under contract to the Canadian Armed Forces in May 1979. Nelson Chan invented WSPS, and was granted patents in 1980.

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