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} |
544 | .~.~.~ Organic material prepared, recovered, or treated |