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

Introduced: September 1968

Last revised: January 2006

Full Title

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

Classification Context

Section:: ELECTRICITY
Class:: ELECTRIC COMMUNICATION TECHNIQUE
Subclass:: TELEPHONIC COMMUNICATION

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