IPC Subgroup
H01J 40/1 Selection of substances for gas fillings
Introduced: January 1980
Last revised: January 2006
Full Title
Photoelectric discharge tubes not involving the ionisation of a gas > Details > Selection of substances for gas fillings
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS