IPC Subgroup
H01J 19/7 Means for obtaining or maintaining the vacuum, e.g. by gettering
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
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
1 direct subcode
Child Classifications
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- H01J 19/72 Tubulations therefor, e.g. for exhausting; Closures therefor