429 / | HD | CHEMISTRY: ELECTRICAL CURRENT PRODUCING APPARATUS, PRODUCT, AND PROCESS |
12 | DF | FUEL CELL, SUBCOMBINATION THEREOF OR METHODS OF OPERATING {10} |
13 | DF | .~ Process of operating {3} |
14 | DF | .~.~ Circulating or feeding electrolyte {1} |
15 | .~.~.~ Active material in electrolyte |