U.S. federal trademark · Serial No. 72193493 · Reg. No. 0811552
SOLID MATERIALS WHICH HAVE BEEN IMPREGNATED WITH KRYPTON GAS CONTAINING THE RADIOACTIVE ISOTOPE KRYPTON 85 FOR USE AS A RADIANT ENERGY SOURCE AND FOR THE DETERMINATION OF MATERIAL SURFACE CHARACTERISTICS SUCH AS TEMPERATURE AND WEAR, FOR GAS DETECTION, AND OTHER MEASUREMENT PROBLEMS
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