| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 315 | | ARRANGEMENTS FOR DIRECT PRODUCTION OF ELECTRIC ENERGY FROM FUSION OR FISSION REACTIONS [G21D-7/00] *** (obtaining electric energy from radioactive sources DIG. 410) {2} |
| DIG 316 | DD | .~> Using magneto-hydrodynamic generators [G21D-7/02] |
| DIG 317 | DD | .~> Using thermoelectric elements and/or thermoionic converters [G21D-7/04] *** (structural combination of fuel element with thermoelectric element and/or thermoionic converter DIG. 84; structural combination of fuel element with thermoelectric element DIG. 415, DIG. 84) |