| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 152 | DD | SHEILDING STRUCTURALLY ASSOCIATED WITH THE REACTOR [G21C-11/00] {3} |
| DIG 160 | DD | .~ Thermal shields; Thermal linings (i.e., for dissipating heat from gamma radiation which would otherwise heat an outer biological shield); Thermal insulation [G21C-11/08] {4} |
| DIG 162 | | .~.~ Consisting of one or more metallic layers [G21C-11/08D] {1} |
| DIG 163 | DD | .~.~.~> Consisting exclusively of several metallic layers [G21C-11/08D2] |