315 / | HD | ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS |
1 | DF | CATHODE RAY TUBE CIRCUITS {11} |
364 | DF | .~ Cathode-ray deflections circuits {16} |
395 | DF | .~.~ Plural potentials or currents applied to deflection member {2} |
398 | .~.~.~ With cathode-ray centering |