IPC Subgroup
H01J 19/38 Control electrodes, e.g. grid
Introduced: September 1968
Last revised: January 2006
Full Title
Details of vacuum tubes of the types covered by group > Non-electron-emitting electrodes; Screens > Control electrodes, e.g. grid
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS