US PATENT SUBCLASS 976 / DIG 232
.~.~ Leak-tightness control [G21C-17/06B] *** (DIG. 234 takes precedence)


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976 /   HD   NUCLEAR TECHNOLOGY

DIG 207  DD  MONITORING; TESTING; MAINTAINING [G21C-17/00] {9}
DIG 231  DD  .~ Devices or arrangements for monitoring or testing fuel or fuel elements (e.g., for burn-up, for contamination, for leak-tightness) not during reactor operation [G21C-17/06] *** (DIG. 235, DIG. 236 take precedence) (detection of leaking fuel elements during reactor operation DIG. 224) {3}
DIG 232.~.~ Leak-tightness control [G21C-17/06B] *** (DIG. 234 takes precedence)