| 313 / | HD | ELECTRIC LAMP AND DISCHARGE DEVICES |
| 364 | DF | CATHODE RAY TUBE {11} |
| 441 | DF | .~ Ray generating or control {6} |
| 446 | DF | .~.~ Including cathode assembly {2} |
| 447 | DF | .~.~.~ With control grid adjacent cathode {1} |
| 448 | DF | .~.~.~.~ With anode {1} |
| 449 | | .~.~.~.~.~ With additional electrode {2} |
| 450 | DF | .~.~.~.~.~.~> With coating or spiral electrode |
| 451 | DF | .~.~.~.~.~.~> With support |