| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 37 | DD | REACTOR FUEL ELEMENTS AND THEIR ASSEMBLIES; SELECTION OF SUBSTANCES FOR USE AS REACTOR FUEL ELEMENTS [G21C-3/00] {5} |
| DIG 58 | DD | .~ Assemblies of number of fuel elements in the form of a rigid unit [G21C-3/30] {2} |
| DIG 59 | DD | .~.~ Bundles of parallel pin-, rod-, or tube-shaped fuel elements [G21C-3/32] {9} |
| DIG 69 | DD | .~.~.~ Spacer elements [G21C-3/32M] *** (spacer grids DIG. 71) {1} |
| DIG 70 | | .~.~.~.~ Helicoidal spacer elements [G21C-3/32M2] |