IPC Subgroup
H04M 1/738 Interface circuits for coupling substations to external telephone lines
Introduced: January 2000
Last revised: January 2006
Full Title
Substation equipment, e.g. for use by subscribers > Interface circuits for coupling substations to external telephone lines
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TELEPHONIC COMMUNICATION
2 direct subcodes
Child Classifications
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