| 327 / | HD | MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS |
| 524 | DF | SPECIFIC IDENTIFIABLE DEVICE, CIRCUIT, OR SYSTEM {22} |
| 598 | DF | .~ With particular tube structure {2} |
| 601 | DF | .~.~ Gas tube {1} |
| 602 | ![]() | .~.~.~ With particular electrode arrangement |