US PATENT SUBCLASS 313 / 443
.~.~.~ Internal

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  DF  .~.~ With magnetic focus {1}
443.~.~.~ Internal

DEFINITION

Classification: 313/443

(under subclass 442) Subject matter wherein the magnetic focus structure forms part of or is located within the envelope.