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