DIFF Subgroup
H04Q 1/20 Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
Introduced: September 1968
Full Title
Details of selecting apparatus or arrangements > Electrical details > Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
Navigate with arrow keys, Enter to open