Drums

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Indicating the time by visual means > Indicating by numbered bands, drums, discs, or sheets > Drums

CPC:

Indicating the time by visual means ( by electric lamps G04C17/02; display arrangements in general G09F) > Indicating by numbered bands, drums, discs, or sheets > Drums

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