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} |
157.9 | .~.~.~ Alcohol product produced {1} | |
157.91 | DF | .~.~.~.~> Fused or bridged ring containing |