US PATENT SUBCLASS 313 / 522
.~ Incandescent filament display

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

513  DF  WITH CHARACTER DISPLAY (E.G., DIGITS OR LETTERS) {2}
522.~ Incandescent filament display

DEFINITION

Classification: 313/522

(under subclass 513) Subject matter including a filament in the shape of a character.