US PATENT SUBCLASS 313 / 400
.~.~ With display

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

364  DF  CATHODE RAY TUBE {11}
399  DF  .~ Secondary emissive electrode {2}
400.~.~ With display

DEFINITION

Classification: 313/400

(under subclass 399) Subject matter including an element producing a visual display in response to electron irradiation from the secondary emissive electrode.