To this effect, means for sensing an abnormal condition of the machine tool is provided in the vicinity of {HEAD ~ an essential portion} of {TAIL ~ the machine tool} 
of
To this effect , means for sensing an abnormal condition of the machine tool is provided in the vicinity of { HEAD ~ an essential portion } of { TAIL ~ the machine tool }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL