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