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