204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
193 | DF | APPARATUS {5} |
194 | DF | .~ Electrolytic {11} |
* | DD | .~.~ With movable electrode means {7} |
206 | .~.~.~ Continuous strip or filament electrode {2} | |
207 | DF | .~.~.~.~> With base treatment {3} |
211 | DF | .~.~.~.~> With current control |