| 204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
| 193 | | APPARATUS {5} |
| 194 | DF | .~> Electrolytic {11} |
| 298.01 | DF | .~> Coating, forming or etching by sputtering {2} |
| 298.41 | DF | .~> Vacuum arc discharge coating |
| 600 | DF | .~> Electrophoretic or electro-osmotic apparatus {11} |
| 660 | DF | .~> Apparatus for electrical (including simultaneous electrical and magnetic) separation or purification of liquid or magnetic treatment of liquid (other than separation) {10} |