204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
193 | DF | APPARATUS {5} |
194 | DF | .~ Electrolytic {11} |
* | DD | .~.~ With movable electrode means {7} |
212 | DF | .~.~.~ Rotary {3} |
215 | .~.~.~.~ With base treatment {2} | |
216 | DF | .~.~.~.~.~> Stripping |
217 | DF | .~.~.~.~.~> Mechanical working |