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DIFF Subgroup Additional Only
H01J 2201/2803

Characterised by the shape or size

Full Title

Electrodes common to discharge tubes > Heaters for thermionic cathodes > Characterised by the shape or size

Of 14 combined children, 0 exist in both systems.

14 codes are CPC-only extensions.

Note: 14 CPC extensions are marked as secondary classification only.