DIFF Subgroup
G04C 17/02 by electric lamps
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Indicating the time optically by electric means > by electric lamps
CPC:
Indicating the time optically by electric means (G04C19/00 takes precedence) > by electric lamps
No child classifications to compare. This is a leaf node in both IPC and CPC.