| 313 / | HD | ELECTRIC LAMP AND DISCHARGE DEVICES |
|
| 567 |  | WITH GAS OR VAPOR {24} |
| 568 | DF | .~> Having a particular total or partial pressure {4} |
| 578 | DF | .~> Incandescent filament lamp {2} |
| 581 | DF | .~> Three or more electrode discharge device {9} |
| 605 | DF | .~> Mean free-path spacing of envelope portions or content parts {1} |
| 607 | DF | .~> Having electrode exterior to envelope |
| 608 | DF | .~> Single electrode type discharge device, or including particulate material |
| 609 | DF | .~> Having baffle, partition, or constricting means affecting discharge {2} |
| 613 | DF | .~> Having electrode shield {3} |
| 617 | DF | .~> Having spur electrode |
| 618 | DF | .~> Having hollow cathode |
| 619 | DF | .~> Negative or cathode glow device |
| 620 | DF | .~> Having specified electrode spacing |
| 621 | DF | .~> Having electrodes with geometrical relationship |
| 622 | DF | .~> Discharge device with diverse electrodes |
| 623 | DF | .~> Having electrode lead-in or electrode support sealed to envelope {2} |
| 626 | DF | .~> Having lead-in shield |
| 627 | DF | .~> Having electrode heated by space discharge current {1} |
| 629 | DF | .~> Having resistance heated cathode |
| 630 | DF | .~> Having electrode of alkali, alkaline or rare earth material |
| 631 | DF | .~> Having particular electrode structure {1} |
| 633 | DF | .~> Electrode composition |
| 634 | DF | .~> Envelope with particular structure {1} |
| 636 | DF | .~> Envelope composition |
| 637 | DF | .~> With particular gas or vapor {2} |