204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
193 | DF | APPARATUS {5} |
194 | DF | .~ Electrolytic {11} |
* | DD | .~.~ With movable electrode means {7} |
212 | .~.~.~ Rotary {3} | |
213 | DF | .~.~.~.~> Barrels and rotary receptacles {1} |
215 | DF | .~.~.~.~> With base treatment {2} |
218 | DF | .~.~.~.~> With current control |