CPC Subgroup
H01J 19/02 Electron-emitting electrodes; Cathodes
Full Title
Details of vacuum tubes of the types covered by group H01J21/00 > Electron-emitting electrodes; Cathodes
2 direct subcodes
Child Classifications
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- H01J 19/04 Thermionic cathodes
- H01J 19/24 Cold cathodes, e.g. field-emissive cathode