{HEAD ~ Means} for sensing an abnormal condition of the machine tool is provided in the vicinity of an essential portion of {TAIL ~ the machine tool} 
{ HEAD ~ Means } for sensing an abnormal condition of the machine tool is provided in the vicinity of an essential portion of { TAIL ~ the machine tool }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL