CPC Subgroup
H04B 1/74 for increasing reliability, e.g. using redundant or spare channels or apparatus
Full Title
Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission > for increasing reliability, e.g. using redundant or spare channels or apparatus
1 direct subcode
Child Classifications
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