US PATENT SUBCLASS 976 / DIG 13
.~.~.~ Where the core is divided into zones with fuel and zones with breeding material [G21C-1/02B2]


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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 11  DD  .~ Fast fission reactors (i.e., reactors not using a moderator; metal cooled reactors; fast breeders) [G21C-1/02] {3}
DIG 12  DD  .~.~ Characterized by the concept and properties of the core [G21C-1/02B] {1}
DIG 13.~.~.~ Where the core is divided into zones with fuel and zones with breeding material [G21C-1/02B2]