| 976 / | HD | NUCLEAR TECHNOLOGY |
| DIG 427 | DD | ARRANGEMENTS FOR HANDLING RADIATION OR PARTICLES (e.g., focusing, moderating [G21K-1/00] *** (radiation filters DIG. 435) {6} |
| DIG 431 | | .~ Using diffraction, refraction or reflection, e.g., monochromators [G21K-1/06] *** (DIG. 435, 445 take precedence) |