314 / | HD | ELECTRIC LAMP AND DISCHARGE DEVICES: CONSUMABLE ELECTRODES |
51 | DF | PLURAL MOVABLE ELECTRODES {1} |
52 | DF | .~ Plural electrode feeding {1} |
53 | .~.~ Interconnected operator {3} | |
54 | DF | .~.~.~> With separate movement of one electrode |
55 | DF | .~.~.~> With diverse rates of feed |
56 | DF | .~.~.~> Gear-, belt-, or chain-connected |