US PATENT SUBCLASS 327 / 338
.~.~ With thermionic tube

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

334  DF  SPECIFIC INPUT TO OUTPUT FUNCTION {9}
336  DF  .~ By integrating {9}
338.~.~ With thermionic tube

DEFINITION

Classification: 327/338

With thermionic tube:

(under subclass 336) Subject matter including an electron tube which ejects electrons by elevating the temperature of the tube cathode.