| 250 / | HD | RADIANT ENERGY |
|
| 336.1 | DF | INVISIBLE RADIANT ENERGY RESPONSIVE ELECTRIC SIGNALLING {16} |
| 374 |  | .~ Including a radiant energy responsive gas discharge device {8} |
| 375 | DF | .~.~> Methods |
| 376 | DF | .~.~> With electroscopic indicators {2} |
| 379 | DF | .~.~> With means to supply the gas {2} |
| 382 | DF | .~.~> With means to ionize the gas {2} |
| 385.1 | DF | .~.~> Plural chambers or three or more electrodes {1} |
| 386 | DF | .~.~> With a periodic electrode bias varying means |
| 387 | DF | .~.~> With periodic electrode bias supply |
| 388 | DF | .~.~> With indicator |