IPC Subgroup
H01J 13/2 Control electrodes, e.g. grid
Introduced: September 1968
Last revised: January 2006
Full Title
Discharge tubes with liquid-pool cathodes, e.g. metal-vapour rectifying tubes > Details > Control electrodes, e.g. grid
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS