| 208 / | HD | MINERAL OILS: PROCESSES AND PRODUCTS |
| 177 | DF | REFINING {23} |
| 283 | DF | .~ With alkali or alkali earth metal compound (except clays) {1} |
| 284 | | .~.~ Alkali metal compound {4} |
| 285 | DF | .~.~.~> With preliminary treatment of the oil |
| 286 | DF | .~.~.~> With subsequent treatment of the oil |
| 287 | DF | .~.~.~> With solid carrier |
| 288 | DF | .~.~.~> With added material |