The REAXX saw uses a completely different method to stop the blade so it is the electrical side of the patent that is being used to stop the only other example.

The REAXX saw uses a completely different method to stop the blade so it is the electrical side of the patent that is being used to stop the only other example. Also, the electrical side of the patent seems to be the most obvious. Detecting touch on metal has been around for > 30 year. Seems like the obvious way to answer the question of how to tell if somebody is touching a metal blade.