In this way, {TAIL ~ a roll} having {HEAD ~ an outer circumferential surface} of three different radial heights, when measured from the axis of the roll, should be understood as having a base surface and a first and second element, which correspond to the three surfaces respectively 
In this way , { TAIL ~ a roll } having { HEAD ~ an outer circumferential surface } of three different radial heights , when measured from the axis of the roll , should be understood as having a base surface and a first and second element , which correspond to the three surfaces respectively
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH