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PCE
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DIFF Subgroup Additional Only
H01J 2201/30446

characterised by the emitter material

Full Title

Electrodes common to discharge tubes > Cold cathodes > Field emission cathodes > characterised by the emitter material

Of 7 combined children, 0 exist in both systems.

7 codes are CPC-only extensions.

Note: 7 CPC extensions are marked as secondary classification only.