Method of saving string of {TAIL ~ tools} installed in {HEAD ~ an oil well} and a corresponding transmission assembly 
Method of saving string of { TAIL ~ tools } installed in { HEAD ~ an oil well } and a corresponding transmission assembly
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH