a reference device for cooperating with the cylindrical part in orbital motion and defining {HEAD ~ a checking condition} of {TAIL ~ said apparatus} 
of
a reference device for cooperating with the cylindrical part in orbital motion and defining { HEAD ~ a checking condition } of { TAIL ~ said apparatus }
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