CPC Main Group
H04B 17/00 Monitoring; Testing (of line transmission systems H04B3/46; arrangements for monitoring or testing transmission systems employing electromagnetic waves other than radio waves H04B10/07)
5 direct subcodes
Child Classifications
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- H04B 17/10 of transmitters
- H04B 17/20 of receivers
- H04B 17/30 of propagation channels
- H04B 17/40 of relay systems