IPC Subgroup
H01J 17/52 with one cathode and one anode
Introduced: September 1968
Last revised: January 2006
Full Title
Gas-filled discharge tubes with solid cathodes > Thermionic-cathode tubes > with one cathode and one anode
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
1 direct subcode
Child Classifications
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- H01J 17/54 having one or more control electrodes