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The Chinese designed a flying top.
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When Leonardo da Vinci designed the sketches of a flying artifact, the Chinese had already created the top part of the flyer.
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When the Argentine Raul Pateras made the first flight of the Leonardo da Vinci helicopter, he had already created the Boseto.
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When people created a device from Juan de la Cierva's autogyro, Raul had already flown the helicopter.
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When the aeronautical engineers began their experiments with the TsAGI 1-EA, already Juan de la cierva had developed the autogyro.
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When Germany used the small-scale helicopter during the Second World War, Juan de la Cerva had already invented the autogyro.
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When the arthur young helicopter was designed and authorized for civilian use, the Flettner FL 282 Kolibri had already been used for the second world gerra.
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