IPC Subgroup
H01J 21/04 without control means, i.e. diodes
Introduced: September 1968
Last revised: January 2006
Full Title
Vacuum tubes > Tubes with a single discharge path > without control means, i.e. diodes
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS