hi, i just bought an old lok rancher stockman and have got 2 more waiting to be bought . Its a knife with a locking safety in the middle of the handle. Also just picked up a 76 camillus knife catalog and in it they also made a large lockback with the safety,my question is if they went through the trouble of patenting it and it seems to be a good idea, i wish my queen stockman had it,why dont they use this idea anymore