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Principle of the helicopter, drawing by Leonardo da Vinci

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Principle of the helicopter, drawing by Leonardo da Vinci.jpg Principle of the parachute, drawing by Leonardo da VinciThumbnailsCarillon, NetherlandsPrinciple of the parachute, drawing by Leonardo da VinciThumbnailsCarillon, NetherlandsPrinciple of the parachute, drawing by Leonardo da VinciThumbnailsCarillon, Netherlands

Principle of the helicopter, drawing by Leonardo da Vinci