| 204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
| * | DD | PROCESSES AND PRODUCTS {7} |
| 164 | DF | .~ Electrostatic field or electrical discharge {6} |
| 165 | DF | .~.~ Organic {3} |
| 168 | | .~.~.~ Hydrocarbons {3} |
| 169 | DF | .~.~.~.~> Halogenated or oxidized |
| 170 | DF | .~.~.~.~> Gaseous {1} |
| 172 | DF | .~.~.~.~> Cracking hydrocarbon oils |