DIFF Subgroup Additional Only
H01J 2237/20 Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated
Full Title
Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging > Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated
Of 10 combined children, 0 exist in both systems.
10 codes are CPC-only extensions.
Note: 10 CPC extensions are marked as secondary classification only.