429 / | HD | CHEMISTRY: ELECTRICAL CURRENT PRODUCING APPARATUS, PRODUCT, AND PROCESS |
12 | DF | FUEL CELL, SUBCOMBINATION THEREOF OR METHODS OF OPERATING {10} |
22 | .~ Automatic control means {3} | |
23 | DF | .~.~> Electrical output dependent |
24 | DF | .~.~> Temperature dependent |
25 | DF | .~.~> Pressure dependent |