US PATENT SUBCLASS 976 / DIG 132
.~ By displacement of the moderator or parts thereof; by changing the moderator concentration [G21C-7/26]

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976 /   HD   NUCLEAR TECHNOLOGY

DIG 113  DD  CONTROL OF NUCLEAR REACTION [G21C-7/00] {9}
DIG 132.~ By displacement of the moderator or parts thereof; by changing the moderator concentration [G21C-7/26] {1}
DIG 133  DD  .~.~> Spectral shift control [G21C-7/26B]