231 |
Manufacture of glass and glass products |
232 |
Manufacture of refractory products |
233 |
Manufacture of clay building materials |
234 |
Manufacture of other porcelain and ceramic products |
235 |
Manufacture of cement, lime and plaster |
236 |
Manufacture of articles of concrete, cement and plaster |
237 |
Cutting, shaping and finishing of stone |
239 |
Manufacture of abrasive products and non-metallic mineral products n.e.c. |