DIFF Subgroup Additional Only
H01J 2229/568 using supplementary correction devices
Full Title
Details of cathode ray tubes or electron beam tubes (H01J2329/00 takes precedence) > Correction of beam optics > using supplementary correction devices
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Note: 1 CPC extensions are marked as secondary classification only.