is limited to fix {HEAD ~ the predetermined resting position} of {TAIL ~ the heat tongue} and whereby the heat tongue may be freely advanced upwardly by the lower pressure plate during a heat seal operation 
of
is limited to fix { HEAD ~ the predetermined resting position } of { TAIL ~ the heat tongue } and whereby the heat tongue may be freely advanced upwardly by the lower pressure plate during a heat seal operation
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL 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