IPC Subgroup
H01J 17/5 Thermionic-cathode tubes
Introduced: September 1968
Last revised: January 2006
Full Title
Gas-filled discharge tubes with solid cathodes > Thermionic-cathode tubes
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
Related Keywords
THYRATRONS
2 direct subcodes
Child Classifications
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- H01J 17/52 with one cathode and one anode
- H01J 17/58 with more than one cathode or anode