{TAIL ~ Air} is conveyed onto the engraving work surface to cool the workpiece and reduce {HEAD ~ the possibility} of fire 
{ TAIL ~ Air } is conveyed onto the engraving work surface to cool the workpiece and reduce { HEAD ~ the possibility } of fire
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH