Gold and other precious metal refining
|
2421 |
Non-ferrous smelting and refining , except precious metals
|
2422 |
Non-ferrous rolling, drawing and extrusion mills
|
2423 |
Manufacture of pipe fittings of non-ferrous metals
|
2424 |
Manufacture of basic precious and other non-ferrous metals, n.e.c.
|
2429 |