The workpiece may be a single piece of material or a plurality of {HEAD ~ pieces} of material which are bonded together under the influence of {TAIL ~ heat} and pressure 
The workpiece may be a single piece of material or a plurality of { HEAD ~ pieces } of material which are bonded together under the influence of { TAIL ~ heat } and pressure
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH