CPC Subgroup Additional Only
H01J 2229/56 Correction of beam optics
Full Title
Details of cathode ray tubes or electron beam tubes (H01J2329/00 takes precedence) > Correction of beam optics
2 direct subcodes
Child Classifications
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- H01J 2229/563 Aberrations by type
- H01J 2229/568 using supplementary correction devices