Years ago I had bought a knife at the Tipton Gun Show that was "bolster locking" ie, it was a lock blade and to unlock it you pushed up on one side of the front bolster while pushing down on the other side. It was very unique and I think from Frost? I gave it to the son of my boss for taking care of my dog while in the hospital. Has anyone ever had/seen on of these knives or know of one made today?