CPC Main Group Additional Only
H01J 2201/00 Electrodes common to discharge tubes
6 direct subcodes
Child Classifications
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- H01J 2201/02 Arrangements for eliminating deleterious effects
- H01J 2201/19 Thermionic cathodes
- H01J 2201/28 Heaters for thermionic cathodes
- H01J 2201/30 Cold cathodes
- H01J 2201/32 Secondary emission electrodes
- H01J 2201/34 Photoemissive electrodes