Machines, namely, [ aircraft engines, ] gas turbines not for land vehicles, [ turbochargers for machines and centrifuges; engines not for land vehicles; boat engines; ] machine parts, namely, bearings; turbines not for land vehicles; pump impellers; turbocharger compressor wheels

common metals and their alloys; nickel and cobalt-based superalloys; titanium alloys; pipes and tubes of metal; goods of common metal not included in other classes, namely, ring-shaped fittings of metal for use in aerospace and industrial gas turbines; aluminum, nickel, molybdenum, chromium, titanium and cobalt ores; metal castings; metal forgings; machined components, namely, ring-shaped fittings of metal for use in aerospace and industrial gas turbines; metal casings