| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 410 | DD | ARRANGEMENTS FOR OBTRAINING ELECTRICAL ENERGY FROM RADIOACTIVE SOURCES (e.g., from radioactive isotopes, nuclear or atomic batteries) [G21H-1/00] *** (fusion reactors DIG. 1+; nuclear reactors DIG. 5+) {6} |
| DIG 411 | | .~ Cells charged directly by beta radiation [G21H-1/02] |