However, in {HEAD ~ variations} of {TAIL ~ the tip distal end surface} 34, the annular surface may be positioned at an angle to the normal plane ranging between 30° and 5° 
of
However , in { HEAD ~ variations } of { TAIL ~ the tip distal end surface } 34 , the annular surface may be positioned at an angle to the normal plane ranging between 30 ° and 5 °
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH