250 / | HD | RADIANT ENERGY |
472.1 | DF | INVISIBLE RADIATION RESPONSIVE NONELECTRIC SIGNALLING {4} |
483.1 | DF | .~ Luminescent device {4} |
484.2 | DF | .~.~ Requiring an additional energy source to cause luminescence {2} |
484.3 | .~.~.~ With thermally-stimulated phosphor |