204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
193 | DF | APPARATUS {5} |
194 | DF | .~ Electrolytic {11} |
242 | DF | .~.~ Cells {10} |
252 | DF | .~.~.~ Diaphragm type {6} |
253 | .~.~.~.~ Plural cells {2} | |
254 | DF | .~.~.~.~.~> Bipolar electrode {1} |
257 | DF | .~.~.~.~.~> With feeding and/or withdrawal means {1} |