US PATENT SUBCLASS 976 / DIG 235
.~ Structural combination of reactor core or moderator structure with viewing means (e.g., with television camera, periscope, window) [G21C-17/08]

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976 /   HD   NUCLEAR TECHNOLOGY

DIG 207  DD  MONITORING; TESTING; MAINTAINING [G21C-17/00] {9}
DIG 235.~ Structural combination of reactor core or moderator structure with viewing means (e.g., with television camera, periscope, window) [G21C-17/08]