| 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} |
| 518 | DF | .~.~ Barrier separation (e.g., using membrane, filter paper, etc.) {5} |
| 520 | DF | .~.~.~ Ion selective {8} |
| 537 | DF | .~.~.~.~ Using bipolar membrane {1} |
| 538 | | .~.~.~.~.~ Water splitting |