CPC Subgroup
H04B 1/66 for reducing bandwidth of signals; for improving efficiency of transmission (H04B1/68 takes precedence)
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 reducing bandwidth of signals; for improving efficiency of transmission (H04B1/68 takes precedence)
3 direct subcodes
Child Classifications
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