| 327 / | HD | MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS |
| 365 | DF | GATING (I.E., SWITCHING INPUT TO OUTPUT) {12} |
| 366 | DF | .~ Superconductive (e.g., cryogenic, etc.) device {5} |
| 369 | DF | .~.~ External control (e.g., piezoelectric, light, etc.) {2} |
| 370 | ![]() | .~.~.~ Magnetic field control |