IPC Subgroup
H04B 7/14 Relay systems
Introduced: September 1968
Last revised: January 2006
Full Title
Radio transmission systems, i.e. using radiation field > Relay systems
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- TRANSMISSION
Related Keywords
telecommunication RELAY(S) systems
2 direct subcodes
Child Classifications
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- H04B 7/145 Passive relay systems
- H04B 7/15 Active relay systems