IPC Subgroup
H01J 19/56 characterised by the material of the vessel or container
Introduced: September 1968
Last revised: January 2006
Full Title
Details of vacuum tubes of the types covered by group > Vessels; Containers; Shields associated therewith > characterised by the material of the vessel or container
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS