CPC Subgroup Additional Only
H01J 2237/004 Charge control of objects or beams
Full Title
Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging > Charge control of objects or beams
2 direct subcodes
Child Classifications
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- H01J 2237/0041 Neutralising arrangements
- H01J 2237/0048 Charging arrangements