While canister 42 is shown as a cylindrical cross section, {HEAD ~ conical cross section elements} may be employed in {TAIL ~ alternative embodiments} 
employed in
While canister 42 is shown as a cylindrical cross section , { HEAD ~ conical cross section elements } may be employed in { TAIL ~ alternative embodiments }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL