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| 2710 | 331513 | * | steel tube fittings made from purchased steel | |
| | 332111 | * | iron or steel semifinished shapes | |
| | 332312 | * | concrete reinforcing bars | |
| | 332912 | * | ferrous fluid power hose fittings made from purchased ferrous materials | |
| | 332919 | * | flanges, unions, and other pipe fittings made from purchased pipe | |
| | 332996 | * | fabricated metal pipe fittings made from purchased pipe, steel, aluminum, lead, zinc, or tin pipe | |
| 2720 | 322221 | * | laminating purchased foil and paper for packaging uses, foil as primary component | |
| | 322222 | * | precious metal foil laminates made from purchased foil, aluminum foil laminates made from purchased aluminum foil as primary component | |
| | 322225 | | aluminum foil packaging laminates made from purchased foil, tinfoil packaging laminates made from purchased tinfoil | |
| | 331112 | * | high purity additive elements with little or no iron content used in steel production | |
| | 331311 | | production of alumina generally from bauxite | |
| | 331312 | | production of aluminum from alumina | |
| | 331314 | | production of aluminum from scrap, alloying aluminum, production of aluminum powder, paste, or flake from purchased aluminum | |
| | 331315 | | flat rolling or continuous casting of purchased aluminum, recovery of aluminum from scrap and flat rolling or continuous casting | |
| | 331316 | | extruding purchased aluminum or secondary production and extrusion of aluminum | |
| | 331319 | * | other rolling or drawing of purchased aluminum, including wire drawing, other secondary production and rolling and drawing | |
| | 331411 | | primary production of copper | |
| | 331419 | * | primary refining of silver, gold, platinum, and other precious metals, and cladding base metals in primary smelting facilities, primary smelting and refining of zinc, tin, and lead, primary smelting and refining or other nonferrous metals (except precious, copper, aluminum, lead, zinc, and tin) | |
| | 331421 | * | rolling, drawing, extruding purchased copper or secondary production of copper and rolling, drawing, and extruding in integrated mills (including bronze) | |
| | 331422 | * | drawing copper wire from purchased wire | |
| | 331423 | | secondary smelting and refining or alloying of purchased copper | |
| | 331491 | * | rolling, drawing, extruding, etc., purchased precious metals, secondary smelting of lead, zinc, and tin; rolling, drawing, and extruding purchased zinc, tin, and lead, rolling, drawing and extruding purchased miscellaneous nonferrous metals or secondary production and rolling, drawing and extruding in integrated mills | |
| | 331492 | | secondary smelting and refining, including alloying purchased precious metals and cladding base metals with purchased precious metals, secondary smelting and refining of tin, zinc, and lead; alloying purchased zinc, lead, or tin, secondary smelting, refining, or alloying miscellaneous nonferrous metals | |
| | 332912 | * | aluminum fluid power hose fittings, lead, zinc, or tin fluid power hose fittings, copper fluid power hose fittings, fluid power hose fittings made from purchased nonferrous metal | |
| | 332913 | * | copper pipe fittings (such as copper elbows, unions, and compression fittings) | |
| | 332996 | * | pipe and pipe fittings made from purchased other nonferrous metal pipe | |
| | 332999 | * | beating precious metals (to get foil, leaf, etc.), aluminum freezer foil not made in rolling mills, lead, zinc, or tin foil and leaf made from purchased foil, copper foil and leaf made from purchased foil, miscellaneous nonferrous metal foil made from purchased foil | |
| 2731 | 331511 | * | iron castings made from purchased iron | |
| | 331512 | | steel investment castings made form purchased steel | |
| | 331513 | * | steel foundries (except investment foundries) | |
| 2732 | 331521 | | aluminum die-casting from purchased aluminum | |
| | 331522 | | other light metal die-casting from purchased light metals, other nonferrous die-casting of purchased nonferrous metals | |
| | 331524 | | other aluminum castings from purchased aluminum | |
| | 331525 | | copper castings made from purchased copper | |
| | 331528 | | other light metal castings made from purchased light metals, other nonferrous castings made from purchased nonferrous metals | |
| 2811 | 332311 | | prefabricated metal buildings and sections of buildings | |
| | 332312 | * | fabricated structural metal such as joists and tower sections, steel racks for railcars | |
| | 332313 | * | plate work such as troughs, tunnel lining, smokestacks, and similar platework products | |
| | 332321 | | metal doors, windows, sash, thresholds, shutters, metal molding and trim (except automotive), metal garage doors, hanger doors, and similar | |
| | 332322 | * | building sheet metal work, such as ducts, awnings, culverts, ornamental metal partitions, downspouts, sheet metal roofing, sheet metal studs, flues, hoods, mail chutes, and similar | |
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