DIFF Subgroup
H01J 19/52 without fixed connection between spacing member and envelope
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Details of vacuum tubes of the types covered by group > Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies > Spacing members extending to the envelope > without fixed connection between spacing member and envelope
CPC:
Details of vacuum tubes of the types covered by group H01J21/00 > Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies > Spacing members extending to the envelope > without fixed connection between spacing member and envelope
No child classifications to compare. This is a leaf node in both IPC and CPC.