Computer 36 may also automatically activate the conventional alarm 32 to alert the drilling operator to {HEAD ~ the occurrence} of {TAIL ~ a kick} 
of
Computer 36 may also automatically activate the conventional alarm 32 to alert the drilling operator to { HEAD ~ the occurrence } of { TAIL ~ a kick }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL