| Naics index | Naics index description |
|---|---|
| 331410 | Tin refining, primary |
| 331410 | Titanium refining, primary |
| 331410 | Uranium refining, primary |
| 331410 | Zinc refining, primary |
| 331410 | Zirconium refining, primary |
| 331420 | Powder made from purchased copper |
| 331420 | Aircraft and automotive wire or cable made from purchased copper in wire drawing plants |
| 331420 | Alloying purchased copper |
| 331420 | Alloying purchased copper metals |
| 331420 | Apparatus wire or cord made from purchased copper in wire drawing plants |