11 Natural-draft burners for industrial use; Accessories for industrial burners, namely, air control components, pilot lights, burner nozzles, burner injectors, flame arrestors, fuel tanks, thermometers, valves, pressure gauges, pressure transmitters, pressure regulators, liquid level switches, pressure switches; Air control components for industrial burners; Pilot lights for industrial burners; Nozzles for industrial burners; Injectors for industrial burners; Flame arrestors for industrial burners; Fuel tanks for industrial burners; Installation components for industrial burners; Valves for industrial burners; Pre-assembled fuel trains for industrial burners