CPC Subgroup
H01J 19/28 Non-electron-emitting electrodes; Screens
Full Title
Details of vacuum tubes of the types covered by group H01J21/00 > Non-electron-emitting electrodes; Screens
4 direct subcodes
Child Classifications
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- H01J 19/30 characterised by the material
- H01J 19/32 Anodes
- H01J 19/38 Control electrodes, e.g. grid
- H01J 19/40 Screens for shielding