| 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 221 | | .~.~ Reactor coolants flow measuring or monitoring [G21C-17/02H] *** (measuring volume or mass flow in general G01F) |