IPC Subgroup
H04M 3/26 with means for applying test signals
Introduced: September 1968
Last revised: January 2006
Full Title
Automatic or semi-automatic exchanges > Arrangements for supervision, monitoring or testing > with means for applying test signals
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
2 direct subcodes
Child Classifications
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