IPC Subgroup
H01J 21/26 with means for concentrating the electron stream
Introduced: September 1968
Last revised: January 2006
Full Title
Vacuum tubes > Tubes with more than one discharge path; Multiple tubes, e.g. double diode or triode-hexode > with means for concentrating the electron stream
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS