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