| 204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
| 193 | DF | APPARATUS {5} |
| 194 | DF | .~ Electrolytic {11} |
| * | DD | .~.~ With movable electrode means {7} |
| 219 | ![]() | .~.~.~ Liquid electrode {2} |
| 220 | DF | .~.~.~.~> With electrode recirculation means |
| 221 | DF | .~.~.~.~> With oscillator, reciprocator or agitator |