| 331410 |
Nonferrous metal (except aluminum) shapes made in primary nonferrous metal smelting and refining mills |
| 331410 |
Nonferrous metals (except aluminum) made in primary nonferrous metal smelting and refining mills |
| 331410 |
Nonferrous metals (except aluminum) smelting and refining, primary |
| 331410 |
Platinum refining, primary |
| 331410 |
Precious metals refining, primary |
| 331410 |
Primary refining of copper |
| 331410 |
Primary refining of nonferrous metals (except aluminum) |
| 331410 |
Primary smelting of copper |
| 331410 |
Primary smelting of nonferrous metals (except aluminum) |
| 331410 |
Refining copper, primary |