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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 PrincessMiniaturesPrinciple of the parachute, drawing by Leonardo da VinciPrincessMiniaturesPrinciple of the parachute, drawing by Leonardo da VinciPrincessMiniaturesPrinciple of the parachute, drawing by Leonardo da Vinci

Principle of the helicopter, drawing by Leonardo da Vinci