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