6 Castings and forgings made of ferrous based metal for use in the manufacture of mining, quarrying, excavation and agricultural machines, namely, excavator buckets, gearboxes, bearing housings, structural support frames and transmissions; castings and forgings made of ferrous based metals for use in the manufacture of mining, mineral processing, grinding, crushing, power generation, cement and quarrying machines, namely, grinding mills for grinding rock and stone, crushing machines for crushing rock and stone, machine pump fans, pump impellors, slurry bilge pumps, and component parts therefor; castings and forgings made of ferrous based metals for use in the manufacture of machine parts for nuclear power generation machines, namely, electric pumps, pump control valves, machine compressors and hydraulic turbines; castings and forgings made of ferrous based metals for use in the manufacture of shoveling, dragging, drilling and mining machines, namely, crawler tracks and crawler shoes, and replaceable parts therefor; casting and forgings made of ferrous based metals for use in the manufacture of railway car parts, namely, structural support frames and undercarriages, bogies, side frames, couplings, bearing housings and suspension systems