| 331492 |
Recovering and refining of nonferrous metals (except aluminum, copper) from scrap |
| 331492 |
Recovering silver from used photographic film or X-ray plates |
| 331492 |
Refining nonferrous metals and alloys (except aluminum, copper), secondary |
| 331492 |
Secondary refining of nonferrous metals (except aluminum, copper) |
| 331492 |
Secondary smelting of nonferrous metals (except aluminum, copper) |
| 331492 |
Selenium recovering from scrap and/or alloying purchased metals |
| 331492 |
Silver recovering from scrap and/or alloying purchased metals |
| 331492 |
Silver recovering from used photographic film or X-ray plates |
| 331492 |
Smelting and refining of nonferrous metals (except aluminum, copper), secondary |
| 331492 |
Smelting nonferrous metals (except aluminum, copper), secondary |