DIFF Subgroup
H04M 17/02 Coin-freed or check-freed systems
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Prepayment telephone systems > Coin-freed or check-freed systems
CPC:
Prepayment telephone systems (using a coded card to authorise calls from a telephone set H04M1/675) > Coin-freed or check-freed systems
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
Child Classifications
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