DIFF Subgroup Additional Only
H01J 2329/943 Means for maintaining vacuum within the vessel
Full Title
Electron emission display panels, e.g. field emission display panels > Means for exhausting the vessel or maintaining vacuum within the vessel > Means for maintaining vacuum within the vessel
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.