US PATENT SUBCLASS 976 / DIG 115
.~ By using self-regulating properties of reactor materials (e.g., Doppler effect) [G21C-7/02] *** (arrangements that involve temperature stability DIG. 136)

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976 /   HD   NUCLEAR TECHNOLOGY

DIG 113  DD  CONTROL OF NUCLEAR REACTION [G21C-7/00] {9}
DIG 115.~ By using self-regulating properties of reactor materials (e.g., Doppler effect) [G21C-7/02] *** (arrangements that involve temperature stability DIG. 136) {1}
DIG 116  DD  .~.~> Of burnable poisons [G21C-7/04]