FIGS 2, 4, and 5 show {HEAD ~ the present invention} being practiced with {TAIL ~ an “S” type airlock} 
practiced with
FIGS 2 , 4 , and 5 show { HEAD ~ the present invention } being practiced with { TAIL ~ an “ S ” type airlock }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL