| 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 31 | DD | .~.~ Homogeneous reactors (i.e., in which the fuel and moderator present an effectively homogeneous medium to the neutrons) [G21C-1/24] {2} |
| DIG 32 | | .~.~.~ Single-region reactors [G21C-1/26] |