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CPC Subgroup
H04M 5/18

Arrangements for signalling the class or number of called or calling line from one exchange to another

Full Title

Manual exchanges (substation equipment in general H04M1/00) > Arrangements for signalling the class or number of called or calling line from one exchange to another

1 direct subcode

Child Classifications

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  • H04M 5/20 Arrangements for indicating the numbers of the incoming lines