DIFF Subgroup Additional Only
H01J 2209/26 Sealing parts of the vessel to provide a vacuum enclosure
Full Title
Apparatus and processes for manufacture of discharge tubes > Sealing parts of the vessel to provide a vacuum enclosure
Of 3 combined children, 0 exist in both systems.
3 codes are CPC-only extensions.
Note: 3 CPC extensions are marked as secondary classification only.