IPC Subgroup
H01J 21/2 Tubes with more than one discharge path; Multiple tubes, e.g. double diode or triode-hexode
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
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
3 direct subcodes
Child Classifications
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- H01J 21/22 with movable electrode or electrodes
- H01J 21/24 with variable amplification factor
- H01J 21/26 with means for concentrating the electron stream