US PATENT SUBCLASS 324 / 405
.~ Vacuum tube

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

403  DF  ELECTRIC LAMP OR DISCHARGE DEVICE {3}
405.~ Vacuum tube {5}
406  DF  .~.~> Plural tubes in the testing circuit
407  DF  .~.~> Testing circuit for diverse-type tube
408  DF  .~.~> Circuit for making diverse test
409  DF  .~.~> Testing discharge space characteristic (e.g., emission) {1}
413  DF  .~.~> Shock testing

DEFINITION

Classification: 324/405

Vacuum tube:

(under subclass 403) Subject matter for testing a device which is intended to have an electrical current flow between two spaced electrodes, at least part of the path followed by the discharge being constituted by a gas, vapor, or vacuum.