US PATENT SUBCLASS 313 / 481
.~.~ With getter or gas

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

364  DF  CATHODE RAY TUBE {11}
477 R  DF  .~ Envelope {6}
481.~.~ With getter or gas

DEFINITION

Classification: 313/481

(under subclass 477) Subject matter including means to increase the degree of vacuum or including a gas.