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