Breguet-Dorand "Gyroplane Laboratoire" flew on June 26, 1935. A coaxial design weighing 4.500 pounds, it had twin rotors turning in opposite directions on the same mast. After further development, the aircraft established world's speed, altitude and endurance records. The pilot, barely visible here, sat within the fuselage frame behind the rotor transmission and mast. With Maurice Claisse as test pilot, the helicopter was flown up to the outbreak of World War II.

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