US PATENT SUBCLASS 327 / 353
.~.~ With vacuum 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}
350  DF  .~ Logarithmic {3}
353.~.~ With vacuum tube

DEFINITION

Classification: 327/353

With vacuum tube:

(under subclass 350) Subject matter including a device with sealed envelope which controls the flow of electrons between spaced electrodes through a fully or partially evacuated space.