CPC Subgroup Additional Only
H01J 2237/0492 Lens systems
Full Title
Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging > Means for controlling the discharge > Focusing means > Lens systems
4 direct subcodes
Child Classifications
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- H01J 2237/04922 electromagnetic
- H01J 2237/04924 electrostatic
- H01J 2237/04926 combined
- H01J 2237/04928 Telecentric systems