| 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 167 | DD | .~ Details (e.g., seals, supporting constructions, ventillating arrangements, tube joints with a vessel wall) [G21C-13/02] {7} |
| DIG 169 | DD | .~.~ Seals (e.g., for pressure vessels or containers [G21C-13/02D] {1} |
| DIG 170 | | .~.~.~ For container apertures [G21C-13/02D2] |