DIFF Subgroup
H01J 40/04 Electrodes
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Photoelectric discharge tubes not involving the ionisation of a gas > Details > Electrodes
CPC:
Photoelectric discharge tubes not involving the ionisation of a gas (H01J49/00 takes precedence) > Details > Electrodes
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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