US PATENT SUBCLASS 324 / 413
.~.~ Shock testing

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

403  DF  ELECTRIC LAMP OR DISCHARGE DEVICE {3}
405  DF  .~ Vacuum tube {5}
413.~.~ Shock testing

DEFINITION

Classification: 324/413

Shock testing:

(under subclass 405) Subject matter in which the internal components of the vacuum tube are tested for mechanical vibration by striking the tube envelope with a hammer element.