CPC Subgroup
H04Q 1/18 Electrical details
Full Title
Details of selecting apparatus or arrangements > Electrical details
5 direct subcodes
Child Classifications
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- H04Q 1/20 Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
- H04Q 1/28 Current-supply circuits or arrangements for selection equipment at exchanges
- H04Q 1/30 Signalling arrangements; Manipulation of signalling currents (multiplex systems providing for calling or supervisory signals H04J1/14, H04J3/12)
- H04Q 1/54 Amplifier switched-on automatically in dependence on automatically-selected lines
- H04Q 1/56 Balancing circuitry switched-on automatically in dependence on automatically-selected lines