IPC Subgroup
H01J 13/32 Cooling arrangements; Heating arrangements
Introduced: September 1968
Last revised: January 2006
Full Title
Discharge tubes with liquid-pool cathodes, e.g. metal-vapour rectifying tubes > Details > Cooling arrangements; Heating arrangements
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS