US PATENT SUBCLASS 976 / DIG 26
.~.~.~ Moderator being substantially not pressurized (e.g., swimming-pool reactor [G21C-1/14] *** (DIG. 30 takes precedence)


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976 /   HD   NUCLEAR TECHNOLOGY

DIG 5  DD  NUCLEAR REACTORS [G21C-1/00] *** (fusion reactors H05H-1/00; nuclear explosives DIG. 423; analogue computers therefor G06G-7/54) {4}
DIG 16  DD  .~ Thermal reactors; Epithermal reactors [G21C-1/04] {2}
DIG 17  DD  .~.~ Heterogeneous reactors (i.e., in which the fuel and moderator are separated) [G21C-1/06] {4}
DIG 26.~.~.~ Moderator being substantially not pressurized (e.g., swimming-pool reactor [G21C-1/14] *** (DIG. 30 takes precedence) {1}
DIG 27  DD  .~.~.~.~> Moderator and coolant being different or separated (e.g., sodium-graphite reactor, sodium-heavy water reactor, organic coolant-heavy water reactor) [G21C-1/16] {1}