| 204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
| 193 | DF | APPARATUS {5} |
| 194 | DF | .~ Electrolytic {11} |
| 242 | DF | .~.~ Cells {10} |
| 243.1 | DF | .~.~.~ Fused bath {6} |
| 245 | ![]() | .~.~.~.~ With feeding and/or withdrawal means {2} |
| 246 | DF | .~.~.~.~.~> Gas feeding |
| 247 | DF | .~.~.~.~.~> Gas withdrawal |