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