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CPC Subgroup
H04M 3/60

Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator

Full Title

Automatic or semi-automatic exchanges > Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator

2 direct subcodes

Child Classifications

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  • H04M 3/62 Keyboard equipment
  • H04M 3/64 Arrangements for signalling the number or class of the calling line to the operator (between operators in inter- exchange working H04M5/18)