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PCE
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DIFF Subgroup
H04M 3/62

Keyboard equipment

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

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 > Keyboard equipment

CPC:

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 > Keyboard equipment

No child classifications to compare. This is a leaf node in both IPC and CPC.