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 |