In {TAIL ~ operation}, {HEAD ~ the tube} 20 to be machined is placed in the apparatus 10 
In
In { TAIL ~ operation } , { HEAD ~ the tube } 20 to be machined is placed in the apparatus 10
REL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH