| http://www.w3.org/ns/prov#value | - loading of the wheel assembly. [0015] Optionally, one of the sliding members of the sliding assembly may be coated with a low coefficient of friction or slick coating, such as a diamond like coating (DLC) or the like, to enhance sliding movement of the portions relative to one another and/or to the wheel portion or hub portion, and, thus, to enhance rotation of the wheel portion about the hub por
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