This kind of desmo has the following characteristics:
The separate opening- and closing camshafts are located opposite the valve and the pivot point.
The cams run in the opposite direction because direct gearmesh.
The closing cam is located under and the opening cam located above the pivotpoint.
Two rollers are used as camfollowers.
Only one single (patented) system of this kind known to me.
(Classification = Group 8C)