| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 207 | DD | MONITORING; TESTING; MAINTAINING [G21C-17/00] {9} |
| DIG 215 | DD | .~ Devices or arrangements for monitoring coolant or moderator [G21C-17/02] {7} |
| DIG 224 | DD | .~.~ Detecting burst slugs [G21C-17/04] {4} |
| DIG 225 | | .~.~.~ Characterized by (matrix) systems for checking the coolant channels [G21C-17/04B] |