| http://www.w3.org/ns/prov#value | - The partition member (4) is molded of a metallic material such as aluminum, a synthetic resin material or another rigid material, and is provided along its outer circumference with a circumferentially extending grooves for forming an outer orifice (13) and at its central portion with an opening acting as an inner orifice (14), as shown in FIG. 3.
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