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Stauffer Gyroplane
 In 1939 O L Stauffer of Elkhart IN., USA, built a single-place gyrocopter on which the revolving upper wing locked in place to convert the aircraft into a biplane.
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Stauffer Gyroplane
In 1939 O L Stauffer of Elkhart IN., USA, built a single-place gyrocopter on which the revolving upper wing locked in place to convert the aircraft into a biplane.
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