| 250 / | HD | RADIANT ENERGY |
| 492.1 | DF | IRRADIATION OF OBJECTS OR MATERIAL {2} |
| 492.2 | ![]() | .~ Irradiation of semiconductor devices {4} |
| 492.21 | DF | .~.~> Ion bombardment |
| 492.22 | DF | .~.~> Pattern control |
| 492.23 | DF | .~.~> Variable beam |
| 492.24 | DF | .~.~> Photocathode projection |