DIFF Subgroup Additional Only
H01J 2229/0727 Aperture plate
Full Title
Details of cathode ray tubes or electron beam tubes (H01J2329/00 takes precedence) > Shadow masks > Aperture plate
Of 6 combined children, 0 exist in both systems.
6 codes are CPC-only extensions.
Note: 6 CPC extensions are marked as secondary classification only.