| 204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
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| * | DD | PROCESSES AND PRODUCTS {7} |
| 157.15 | DF | .~ Processes of treating materials by wave energy {6} |
| 157.6 | DF | .~.~ Process or preparing desired organic product containing at least one atom other than carbon and hydrogen {16} |
| 157.94 |  | .~.~.~ Halogen product produced {5} |
| 157.95 | DF | .~.~.~.~> Carbon and halogen only in product {1} |
| 157.98 | DF | .~.~.~.~> Unsaturated product {1} |
| 158.1 | DF | .~.~.~.~> Carbocyclic ring containing |
| 158.11 | DF | .~.~.~.~> Two or more diverse halogen atoms containing |
| 158.12 | DF | .~.~.~.~> Four or more carbon atoms containing |