204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
193 | DF | APPARATUS {5} |
660 | DF | .~ Apparatus for electrical (including simultaneous electrical and magnetic) separation or purification of liquid or magnetic treatment of liquid (other than separation) {10} |
668 | .~.~ With moving or movable electrode {1} | |
669 | DF | .~.~.~> Rotating or rotatable |