US PATENT SUBCLASS 250 / 381
.~.~.~ With radioactive source

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

336.1  DF  INVISIBLE RADIANT ENERGY RESPONSIVE ELECTRIC SIGNALLING {16}
374  DF  .~ Including a radiant energy responsive gas discharge device {8}
379  DF  .~.~ With means to supply the gas {2}
381.~.~.~ With radioactive source

DEFINITION

Classification: 250/381

(under subclass 379) Subject matter in combination with means to ionize the gas between the electrodes comprising a material that emits, spontaneously nuclear particulate or electromagnetic energy.