| http://www.w3.org/ns/prov#value | - Proximal section 580 includes a first ring 584 and a second ring 585 spaced apart from first ring 584 in a longitudinal direction depicted in FIG. 42A as arrow X. First ring 584 preferably includes a flattened surface 584, however, first ring 584 may have any cross-sectional shape including a rectangular, a square or an arcuate shape, for example.
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