| http://www.w3.org/ns/prov#value | - f the tire portion, since the wheel portion is integrally formed along the inner side of the tire portion and the bearing is later inserted and mounted to the wheel portion, the wheel portion cannot be integrally welded to the tire portion and the bearing at the same time, so that there is a problem in that a step for mounting and fixing the bearing to the wheel portion is required.
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