| http://www.w3.org/ns/prov#value | - The outer ring part 31 is provided with a metal ring 311 manufactured by punching and press forming of a metal plate, and a packing 312 made of a rubberlike elastic material vulcanized and bonded integrally in such a manner as an outer circumferential surface of a cylindrical part 311 a of the metal ring 311 and a flange part 311 b extending from the end part of the front side of the cylinder part
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