DIFF Subgroup
H01J 19/70 Means for obtaining or maintaining the vacuum, e.g. by gettering
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Details of vacuum tubes of the types covered by group > Means for obtaining or maintaining the vacuum, e.g. by gettering
CPC:
Details of vacuum tubes of the types covered by group H01J21/00 > Means for obtaining or maintaining the vacuum, e.g. by gettering
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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- H01J 19/72 Tubulations therefor, e.g. for exhausting; Closures therefor IPC+CPC Available in IPC and CPC