| http://www.w3.org/ns/prov#value | - ongitudinal edge thereof defining a rack; (b) a plurality of pads engageable with the outward extending flanges; (c) a pair of vertically movable members associated with each track and including an outer wall spaced from and parallel to the bottom wall, a pair of opposed arcuate side walls integral with the outer wall and curving toward the track and inward to encircle the pads, the vertically mov
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