| 204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
| 193 | DF | APPARATUS {5} |
| 194 | DF | .~ Electrolytic {11} |
| 196.01 | DF | .~.~ Object protection {15} |
| 196.3 | DF | .~.~.~ Rigid anode with rigid support {1} |
| 196.31 | ![]() | .~.~.~.~ Threaded coupling for rigid anode or rigid support {1} |
| 196.32 | DF | .~.~.~.~.~> Dielectric thread |