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} |
213 | DF | .~.~.~.~ Barrels and rotary receptacles {1} |
214 | .~.~.~.~.~ Swinging or tilting receptacles |