After the taking up of {TAIL ~ a sheet} of glass by the upper form, {HEAD ~ a current} of hot gas is blown under the glass sheets in order to produce a pneumatic pressing 
After the taking up of { TAIL ~ a sheet } of glass by the upper form , { HEAD ~ a current } of hot gas is blown under the glass sheets in order to produce a pneumatic pressing
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH