| Industry Group 331: Steel Works, Blast Furnaces, And Rolling And Finishing Mills |
| · | 3312 Steel Works, Blast Furnaces (Including Coke Ovens), and Rolling Mills |
| · | 3313 Electrometallurgical Products, Except Steel |
| · | 3315 Steel Wiredrawing and Steel Nails and Spikes |
| · | 3316 Cold-Rolled Steel Sheet, Strip, and Bars |
| · | 3317 Steel Pipe and Tubes |
| Industry Group 332: Iron And Steel Foundries |
| · | 3321 Gray and Ductile Iron Foundries |
| · | 3322 Malleable Iron Foundries |
| · | 3324 Steel Investment Foundries |
| · | 3325 Steel Foundries, Not Elsewhere Classified |
| Industry Group 333: Primary Smelting And Refining Of Nonferrous |
| · | 3331 Primary Smelting and Refining of Copper |
| · | 3334 Primary Production of Aluminum |
| · | 3339 Primary Smelting and Refining of Nonferrous Metals, Except Copper and Aluminum |
| Industry Group 334: Secondary Smelting And Refining Of Nonferrous |
| · | 3341 Secondary Smelting and Refining of Nonferrous Metals |
| Industry Group 335: Rolling, Drawing, And Extruding Of Nonferrous |
| · | 3351 Rolling, Drawing, and Extruding Of Copper |
| · | 3353 Aluminum Sheet, Plate, and Foil |
| · | 3354 Aluminum Extruded Products |
| · | 3355 Aluminum Rolling and Drawing, Not Elsewhere Classified |
| · | 3356 Rolling, Drawing, and Extruding of Nonferrous Metals, Except Copper and Aluminum |
| · | 3357 Drawing and Insulating of Nonferrous Wire |
| Industry Group 336: Nonferrous Foundries (castings) |
| · | 3363 Aluminum Die-Castings |
| · | 3364 Nonferrous Die-Castings, Except Aluminum |
| · | 3365 Aluminum Foundries |
| · | 3366 Copper Foundries |
| · | 3369 Nonferrous Foundries, Except Aluminum and Copper |
| Industry Group 339: Miscellaneous Primary Metal Products |
| · | 3398 Metal Heat Treating |
| · | 3399 Primary Metal Products, Not Elsewhere Classified |
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