| http://www.w3.org/ns/prov#value | - As the cross-sectional shape of the through hole, for example, a polygon such as quadrangle and octagon, circle, ellipse or the like can be illustrated. [0040] The filter base 2 can be molded, for example, by the extrusion molding method, the injection molding method, the press molding method, or the method in which a ceramic starting material is molded into a cylindrical shape and then through ho
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