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