| http://www.w3.org/ns/prov#value | - In addition, a cover 9 having a cylindrical section 19 is made of metal such as steel or aluminum for covering an opening at the end of a bearing housing 12 and a sensor mounting hole 46 is formed on a portion which is closer to a base end (closer to the right end in FIG. 20) of the cylindrical section 19 of the cover 12 for communication between the inner and outer peripheral surfaces of the cyli
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