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Louis Bréguet built the Gyroplane-Laboratoire, an experimental helicopter that achieved a record speed of 75 miles per hour an

Louis Bréguet built the Gyroplane-Laboratoire, an experimental helicopter that achieved a record speed of 75 miles per hour and climbed to 518 feet in December 1935.  

Credits - Smithsonian Institution, National Air and Space Museum Videodisc 2B-3078