The field of the invention is sealing and retaining {HEAD ~ assemblies} for {TAIL ~ downhole tools} and more specifically downhole tools set by expansion such as, for example, packers, bridge plugs or liner packers 
for
The field of the invention is sealing and retaining { HEAD ~ assemblies } for { TAIL ~ downhole tools } and more specifically downhole tools set by expansion such as , for example , packers , bridge plugs or liner packers
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH