CPC Main Group Additional Only
H04R 2231/00 Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
2 direct subcodes
Child Classifications
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- H04R 2231/001 Moulding aspects of diaphragm or surround
- H04R 2231/003 Manufacturing aspects of the outer suspension of loudspeaker or microphone diaphragms or of their connecting aspects to said diaphragms