Prepayment telephone systems (using a coded card to authorise calls from a telephone set H04M1/675)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Prepayment telephone systems

CPC: Prepayment telephone systems (using a coded card to authorise calls from a telephone set H04M1/675)

Full titles differ between systems:

IPC:

Prepayment telephone systems

CPC:

Prepayment telephone systems (using a coded card to authorise calls from a telephone set H04M1/675)

CPC subdivides this area 13x more granularly than IPC with 12 additional codes.

12 codes are CPC-only extensions.

Note: 6 CPC extensions are marked as secondary classification only.

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H04M 17/005 CPC only CPC only
H04M 17/01 CPC only CPC only
H04M 17/02 Coin-freed or check-freed systems +2 CPC IPC+CPC Available in IPC and CPC
H04M 17/10 +2 CPC CPC only CPC only
H04M 17/20 +3 CPC CPC only CPC only
H04M 17/30 +3 CPC CPC only CPC only
H04M 17/35 CPC only CPC only
H04M 2017/12 2nd only CPC only CPC only
H04M 2017/14 2nd only CPC only CPC only
H04M 2017/22 2nd only +3 CPC CPC only CPC only
H04M 2017/24 2nd only +5 CPC CPC only CPC only
H04M 2017/25 2nd only +4 CPC CPC only CPC only
H04M 2017/26 2nd only CPC only CPC only