More specifically, {HEAD ~ the invention} is in {TAIL ~ the field} of removal of vinyl halides from gas streams 
is in
More specifically , { HEAD ~ the invention } is in { TAIL ~ the field } of removal of vinyl halides from gas streams
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH