Keywords: Science history icon.png Science history icon svg en Icon for the Sciences History Portal from a drawing of Leonardo da Vinci fr Icône pour le Portail Histoire des sciences à partir d'un dessin de Léonard de Vinci it Icona per il portale storia delle scienze Leonardo da Vinci helicopter jpg 2009-08-24 Leonardo da Vinci helicopter jpg Leonardo da Vinci derivative work Frédéric MICHEL Files by -Strogoff- PD-old Other versions Main Drawing enhanced color balanced -Strogoff- Leonardo da Vinci helicopter jpg Atelier graphique Helicopter rotors Aerial screw by Leonardo da Vinci History icons Transport icons |