US PATENT SUBCLASS 313 / 442
.~.~ With magnetic focus

Current as of: June, 1999
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313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

364  DF  CATHODE RAY TUBE {11}
441  DF  .~ Ray generating or control {6}
442.~.~ With magnetic focus {1}
443  DF  .~.~.~> Internal

DEFINITION

Classification: 313/442

(under subclass 441) Subject matter including magnetic means for defining beams cross-section.