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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 VinciThumbnailsFacsimile of Leonardo da Vinci's drawings on artificial wingsPrinciple of the parachute, drawing by Leonardo da VinciThumbnailsFacsimile of Leonardo da Vinci's drawings on artificial wingsPrinciple of the parachute, drawing by Leonardo da VinciThumbnailsFacsimile of Leonardo da Vinci's drawings on artificial wings

Principle of the helicopter, drawing by Leonardo da Vinci