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PCE
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DIFF Subgroup
H01J 19/76

Means structurally associated with the tube for indicating defects or previous use

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Details of vacuum tubes of the types covered by group > Means structurally associated with the tube for indicating defects or previous use

CPC:

Details of vacuum tubes of the types covered by group H01J21/00 > Means structurally associated with the tube for indicating defects or previous use

No child classifications to compare. This is a leaf node in both IPC and CPC.