Common metals, unwrought or semi-wrought; alloys of common metals, unwrought or semi-wrought; steel alloys; steel, unwrought or semi wrought; nickel-silver; aluminum alloys; white metal alloys; bronze; chromium; cobalt ores; copper, unwrought or semi-wrought; tin and its alloys; iron, unwrought or semi-wrought; brass, unwrought or semi-wrought; magnesium and its alloys; manganese; ores of metal; nickel and its alloys; lead, unwrought or semi-wrought; tantalum; titanium; tungsten ores; zinc an...