DIFF Subgroup Additional Only
H01J 2237/304 Controlling tubes
Full Title
Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging > Electron or ion beam tubes for processing objects > Controlling tubes
Of 5 combined children, 0 exist in both systems.
5 codes are CPC-only extensions.
Note: 5 CPC extensions are marked as secondary classification only.