| 430 / | HD | RADIATION IMAGERY CHEMISTRY: PROCESS, COMPOSITION, OR PRODUCT THEREOF | 
| 396 | DF | EFFECTING FRONTAL RADIATION MODIFICATION DURING EXPOSURE, E,G., SCREENING, MASKING, STENCILING, ETC. {1} | 
| 397 |  | .~ Involving motion during exposure, e.g., dodging, etc. |