IPC Subgroup
H01J 19/72 Tubulations therefor, e.g. for exhausting; Closures therefor
Introduced: September 1968
Last revised: January 2006
Full Title
Details of vacuum tubes of the types covered by group > Means for obtaining or maintaining the vacuum, e.g. by gettering > Tubulations therefor, e.g. for exhausting; Closures therefor
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS