Means for exhausting the vessel or 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

Of 2 combined children, 0 exist in both systems.

2 codes are CPC-only extensions.

Note: 2 CPC extensions are marked as secondary classification only.

This code exists only in CPC.

Diff view requires codes present in both systems.