| 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 222 | | .~.~ Moderator or coolant level detection devices [G21C-17/02K] *** (indicating or measuring liquid level in general G01F-23/00) |