327 / | HD | MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS |
100 | DF | SIGNAL CONVERTING, SHAPING, OR GENERATING {29} |
165 | DF | .~ Regenerating or restoring rectangular (e.g., clock, etc.) or pulse waveform {4} |
168 | .~.~ Having inductive device (e.g., transformer, etc.) |