US PATENT SUBCLASS 976 / DIG 422
.~ As tracers [G21H-5/02] *** (medicinal preparations containing radioactive substances A61K-43/00; investigating or analyzing biological material G01N-33/16)

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976 /   HD   NUCLEAR TECHNOLOGY

DIG 421  DD  APPLICATIONS OF RADIATION FROM RADIOACTIVE SOURCES OR ARRANGEMENTS THEREFOR [G21H-5/00] *** {1}
DIG 422.~ As tracers [G21H-5/02] *** (medicinal preparations containing radioactive substances A61K-43/00; investigating or analyzing biological material G01N-33/16)