US PATENT SUBCLASS 313 / 474
.~.~ With optics

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

364  DF  CATHODE RAY TUBE {11}
461  DF  .~ Screen {10}
474.~.~ With optics {1}
475  DF  .~.~.~> Light conducting fiber or rod

DEFINITION

Classification: 313/474

(under subclass 461) Subject matter including optical means combined with the screen.