| 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 6 | DD | .~ Integral reactors (i.e., the reactor core and the heat exchanger are placed in one vessel; the reactor vessel and the heat exchanger form an integral construction) [G21C-1/00B] {4} |
| DIG 7 | | .~.~ Where the prime mover is also placed in the vessel [G21C-1/00B2] |