The method comprising {HEAD ~ the steps} of moving the parts on the belt into a chamber of the furnace, heating the parts, igniting the unused combustible atmosphere above {TAIL ~ the parts}, and allowing the atmosphere above the parts to escape through a vent in the chamber 
The method comprising { HEAD ~ the steps } of moving the parts on the belt into a chamber of the furnace , heating the parts , igniting the unused combustible atmosphere above { TAIL ~ the parts } , and allowing the atmosphere above the parts to escape through a vent in the chamber
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH