CPC Subgroup
H04R 7/04 Plane diaphragms
Full Title
Diaphragms for electromechanical transducers (in general F16J3/00); Cones (for musical instruments G10 ) > characterised by the construction > Plane diaphragms
2 direct subcodes
Child Classifications
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- H04R 7/06 comprising a plurality of sections or layers