The end conical portion has {HEAD ~ a cone half angle} of from {TAIL ~ about 5 to about 10 degrees} 
of from
The end conical portion has { HEAD ~ a cone half angle } of from { TAIL ~ about 5 to about 10 degrees }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL