DIFF Subgroup
H01J 19/72 Tubulations therefor, e.g. for exhausting; Closures therefor
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 > Tubulations therefor, e.g. for exhausting; Closures therefor
CPC:
Details of vacuum tubes of the types covered by group H01J21/00 > Means for obtaining or maintaining the vacuum, e.g. by gettering > Tubulations therefor, e.g. for exhausting; Closures therefor
No child classifications to compare. This is a leaf node in both IPC and CPC.