Illumination; Arrangements for improving the visibility of characters on dials

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Substation equipment, e.g. for use by subscribers > Constructional features of telephone sets > Illumination; Arrangements for improving the visibility of characters on dials

CPC:

Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M3/00; prepayment telephone coin boxes H04M17/00; current supply arrangements H04M19/08) > Constructional features of telephone sets > Illumination; Arrangements for improving the visibility of characters on dials

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