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