CPC Subgroup
H04S 3/002 Full Title
Systems employing more than two channels, e.g. quadraphonic (H04S5/00, H04S7/00 take precedence)
1 direct subcode
Child Classifications
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H04S 3/002 Systems employing more than two channels, e.g. quadraphonic (H04S5/00, H04S7/00 take precedence)
1 direct subcode
Navigate with arrow keys, Enter to open