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 |