
Helicopter
        A helicopter  is a type of rotorcraft in which lift and thrust are supplied by one or more engine-driven rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forwards, backwards, and laterally...
    Timeline of Events
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| 1974 | 
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| 1986 | 
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| 1994 | 
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| 2002 | 
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