204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
193 | DF | APPARATUS {5} |
194 | DF | .~ Electrolytic {11} |
196.01 | DF | .~.~ Object protection {15} |
196.33 | DF | .~.~.~ Flexible cable, chain, or wire anode or support {1} |
196.34 | DF | .~.~.~.~ Plural anode sections on single cable, chain, or wire {1} |
196.35 | .~.~.~.~.~ Helically wound |