33660 - Copper & Copper-base alloy castings, except die
3366020 - - Copper-base alloy sand castings (except bearings & Bushings)
3366021 - - Leaded red & Semi-red brass sand castings (except bearings & Bushings)
3366022 - - Tin bronze sand castings, incl Leaded & High-leaded (except bearings & Bushings)
3366023 - - Other Copper & Copper-base alloy sand castings, incl Yellow & Leaded yellow brasses, Nickel tin bronzes, Nickel silvers, Lead bronzes & Special alloys
3366024 - - Copper & High-copper alloy sand castings (except bearings & Bushings)
3366025 - - Engineered copper alloy sand castings, incl Manganese bronzes, Silicon bronzes & Brasses, Aluminum bronzes & Copper nickels (except bearings & Bushings)
3366026 - - Other Copper alloy sand castings, incl Yellow & Leaded yellow brasses, Nickel tin bronzes, Nickel silvers, Lead bronzes & Special alloys (except bearings & Bushings)
3366031 - - Copper & Copper-base alloy permanent & Semipermanent mold castings (except bearings & Bushings)
3366041 - - Copper & Copper-base alloy centrifugal castings (except bearings & Bushings)
3366051 - - Copper & Copper-base alloy investment castings (except bearings & Bushings)
3366061 - - Other Copper & Copper-base alloy castings, excl die-castings (except bearings & Bushings)
3366072 - - Copper-base alloy bearings & Bushings, Nonmachined
3366XX0 - - Copper foundries (Castings, except die, Miscellaneous)
3366XX2 - - Copper foundries (Castings, except die, Miscellaneous : Speciality )