I have no idea who makes it, but WOW; how different. Wonder how it would work. I guess you'd file the scoring cutters 0* and the clearing cutters at 25 or 30*????? Kind of reverse from the granberg style, actually. Neat idea to have both scorers on one side, but you wouldn't be able to get the smoothness of the cut, IMHO. The clearers on granberg are 0*, right?? scorers at 30*?? Interesting chain. I'd be very interested in how it cuts!