One new feature, commercially available in saws since 2005, is an automatic braking system. The feature's inventor, after trying to license it to manufacturers without success, started SawStop, based in Tualatin, Oregon. SawStop's saws apply a small amount of electric current to the blade of the saw. This current is continuously monitored. If the saw detects a change in this current (as would occur if a hand or other body part came into contact with the blade) an automatic braking system is activated, forcing an aluminum brake block into the blade. The saw stops within five milliseconds, and angular momentum retracts the blade into the table. The operator suffers a small nick instead of an amputation or other more serious injury.