| 313 / | HD | ELECTRIC LAMP AND DISCHARGE DEVICES |
| 513 | DF | WITH CHARACTER DISPLAY (E.G., DIGITS OR LETTERS) {2} |
| 514 | DF | .~ Gaseous discharge medium {4} |
| 517 | | .~.~ With electrode display segments {2} |
| 518 | DF | .~.~.~> With dielectric layer or coating |
| 519 | DF | .~.~.~> Multiple display (i.e., side-by-side) |