US PATENT SUBCLASS 324 / 404
.~ Cathode-ray tube

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

403  DF  ELECTRIC LAMP OR DISCHARGE DEVICE {3}
404.~ Cathode-ray tube

DEFINITION

Classification: 324/404

Cathode-ray tube:

(under subclass 403) Subject matter for testing a discharge device which has means for forming the electric discharge into a restricted beam or ray.