IPC Subgroup
H01J 40/04 Electrodes
Introduced: January 1980
Last revised: January 2006
Full Title
Photoelectric discharge tubes not involving the ionisation of a gas > Details > Electrodes
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
1 direct subcode
Child Classifications
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- H01J 40/06 Photo-emissive cathodes