US PATENT SUBCLASS 323 / 227
.~ Using electronic tube

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

220  DF  IN SHUNT WITH SOURCE OR LOAD {7}
227.~ Using electronic tube {1}
228  DF  .~.~> With additional series regulator

DEFINITION

Classification: 323/227

Using electronic tube:

(under subclass 220) Subject matter wherein the final control device within the shunt circuit is an electric space discharge device.