US PATENT SUBCLASS 323 / 257
.~.~.~.~ Including an electronic tube or a three or more terminal semiconductive device in control circuit

Current as of: June, 1999
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323 /   HD   ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS

234  DF  OUTPUT LEVEL RESPONSIVE {6}
247  DF  .~ Using a transformer or inductor as the final control device {5}
255  DF  .~.~ Having a variable length winding (e.g., tapped) as the final control device {2}
256  DF  .~.~.~ With motor driven tap switch {1}
257.~.~.~.~ Including an electronic tube or a three or more terminal semiconductive device in control circuit

DEFINITION

Classification: 323/257

Including an electronic tube or a three or more terminal semiconductive device in control circuit:

(under subclass 256) Subject matter including a signal processing circuit between the means responsive to the output and the motor, the signal processing circuit including at least one electronic tube or three or more terminal semiconductive device.