| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 306 | DD | ARRANGEMENTS OF REACTOR AND ENGINE IN WHICH REACTOR-PRODUCED HEAT IS CONVERTED INTO MECHANICAL ENERGY [G21D-5/00] {2} |
| DIG 308 | DD | .~ Reactor and engine not structurally combined [G21D-5/04] {2} |
| DIG 309 | | .~.~ With engine working medium circulating through reactor core [G21D-5/06] |