| 204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
| * | DD | PROCESSES AND PRODUCTS {7} |
| 450 | DF | .~ Electrophoresis or electro-osmosis processes and electrolyte compositions therefor when not provided for elsewhere {14} |
| 513 | DF | .~.~ Hydrocarbon oil separated or purified {1} |
| 514 | | .~.~.~ Aqueous system |