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