| 327 / | HD | MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS |
| 100 | DF | SIGNAL CONVERTING, SHAPING, OR GENERATING {29} |
| 231 | DF | .~ Phase shift by less than period of input {7} |
| 233 | DF | .~.~ Correction to specific phase shift {3} |
| 234 | ![]() | .~.~.~ Dependent on variable controlled phase shifts |