Machine parts, namely, metal nozzles which are parts of power-operated sprayers, metal nozzles for use with industrial process machinery, and metal nozzles for use in iron and steel manufacturing processes, namely, [ coke oven cover cleaning, ammonia spraying, blast furnace top watering, tobidoka cooling, converter cooling, ] secondary cooling of continuous casting machine, roll cooling of continuous casting machine, descaling, roll cooling, [ roll tarpaulin, zero spangle and electronic galvanizing line cleaning; ] machine parts, namely, metal nozzles which are parts of steel plant equipment, namely, descaling nozzles, air mist nozzles, [ pneumatic atomizing nozzles, oval spray nozzles, ] thickening flat spray nozzles, [ ramp flat nozzles, ] full-cone nozzles, self-cleaning nozzles, integral type flat spray nozzles [ and liquid ammonia flat spray nozzles; ] machine parts, namely, nozzles which are parts of power-operated sprayers for industrial printing use