204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
* | 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 | DF | .~.~.~ Halogen product produced {5} |
158.11 | .~.~.~.~ Two or more diverse halogen atoms containing |