| http://www.w3.org/ns/prov#value | - le and fine-mesh fabric and a thin-walled sound element with at least one perforation covering the housing orifice, wherein the housing includes a wall containing a perforation that forms the housing orifice, and wherein the membrane is a fabric arranged between said wall containing the perforation that forms the housing orifice and an attached insert part containing perforations. 3.
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