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