hydraulic cylinder, manual control

THE INVENTION CONCERNS HYDRAULIC PISTON WHICH IS PUSHED BY PUMPING MANUAL WHILE HIS RETURN IS MADE BY ACTION MEANS RECALL ELASTIC. INVENTION, THE PISTON 2 fits into the cylinder 1 SO AS TO DEFINE IN ADDITION THAT THE BEDROOM AXIALE 13, AT LEAST A CYLINDER RING AND THE 14 OR displacements RING WARNINGS ARE IN COMMUNICATION WITH aXIAL ROOM AS AND MEASUREMENT ADVANCING THE PISTON.