DIFF Subgroup
H01J 19/10 characterised by the shape
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Details of vacuum tubes of the types covered by group > Electron-emitting electrodes; Cathodes > Thermionic cathodes > characterised by the shape
CPC:
Details of vacuum tubes of the types covered by group H01J21/00 > Electron-emitting electrodes; Cathodes > Thermionic cathodes > characterised by the shape
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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