| 327 / | HD | MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS |
| 100 | DF | SIGNAL CONVERTING, SHAPING, OR GENERATING {29} |
| 113 | DF | .~ Frequency or repetition rate conversion or control {3} |
| 119 | DF | .~.~ Frequency multiplication (e.g., harmonic generation, etc.) {3} |
| 120 | DF | .~.~.~ With plural outputs {1} |
| 121 | ![]() | .~.~.~.~ Selective |