| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 166 | DD | PRESSURE VESSELS; CONTAINMENT VESSELS [G21C-13/00] *** (chemical or physical processes B01J-3/00; pressure vessels in general F16J-12/00) {3} |
| DIG 180 | DD | .~ Vessels characterized by the material; Selection of materials for pressure vessels [G21C-13/08] {2} |
| DIG 181 | | .~.~ Metallic vessels [G21C-13/08B] {1} |
| DIG 182 | DD | .~.~.~> Tube-type vessels (e.g., for not essentially pressurized coolants) [G21C-13/08B2] |