| 208 / | HD | MINERAL OILS: PROCESSES AND PRODUCTS | 
| 46 | DF | CHEMICAL CONVERSION OF HYDROCARBONS {11} | 
| 106 | DF | .~ Cracking {5} | 
| 113 | DF | .~.~ Catalytic {4} | 
| 121 | DF | .~.~.~ Metal or metal oxide containing catalyst {1} | 
| 122 | DF | .~.~.~.~ Group III metal or oxide {2} | 
| 124 |  | .~.~.~.~.~ With Group VIII metal or oxide |