| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 139 | DD | EMERGENCY PROTECTION ARRANGEMENTS STRUCTALLY ASSOCIATED WITH THE REACTOR (e.g., safety valves provided with pressure equalization devices) [G21C-9/00] *** (emergency cooling arrangements DIG. 196) {6} |
| DIG 144 | | .~ Against explosions (e.g., blast shields) [G21C-9/00F] |