| 204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
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| * |  | PROCESSES AND PRODUCTS {7} |
| 155 | DF | .~> Electrical, or wave energy in magnetic field {1} |
| 157.15 | DF | .~> Processes of treating materials by wave energy {6} |
| 164 | DF | .~> Electrostatic field or electrical discharge {6} |
| 450 | DF | .~> Electrophoresis or electro-osmosis processes and electrolyte compositions therefor when not provided for elsewhere {14} |
| 554 | DF | .~> Electrical (including simultaneous electrical and magnetic) separation or purification of liquid or magnetic treatment of liquid (other than separation) {7} |
| 192.1 | DF | .~> Coating, forming or etching by sputtering {3} |
| 192.38 | DF | .~> Vacuum arc discharge coating |