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In an airplane, an aileron, a flap a differential mechanism mounted for swinging movement and including a crank system operatively carried thereby, a push‐pull rod connecting said crank system with said aileron, means actuating said crank system to move said aileron, means for moving said flap, and means operated by said flap moving means for swinging said differential mechanism in a manner to effect a longitudinal change of position of said push‐pull rod and hence movement of said aileron.