IPC Subgroup
H01J 17/2 Selection of substances for gas fillings; Specified operating pressures or temperatures
Introduced: September 1968
Last revised: January 2012
Full Title
Gas-filled discharge tubes with solid cathodes > Details > Selection of substances for gas fillings; Specified operating pressures or temperatures
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS