| 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} |
| 256 | DF | .~.~ Phase inversion (i.e., 180 degrees between input and output) {1} |
| 257 | ![]() | .~.~.~ Multiple outputs |