A Nation patent

 Pass the effort that comes years, there is a new technic that a anti-drill & anti-hammer double pins mortise cylinder get the nation patent of invention applied by ANBO locks company on November 2009,,the new technic make a new inner structure that let the cylinder with more solid body and longer alive, double row pins let the cylinder key with more differ and it can prevent been technic open effectively . this technic had been applied as a utility-type patent also.