315 / | HD | ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS |
1 | DF | CATHODE RAY TUBE CIRCUITS {11} |
364 | DF | .~ Cathode-ray deflections circuits {16} |
379 | DF | .~.~ With additional control of cathode ray {3} |
382 | DF | .~.~.~ With focusing of ray {1} |
382.1 | .~.~.~.~ For television |