| http://www.w3.org/ns/prov#value | - mechanism including an elongated positioning base that is pivoted to the leg unit through the pivot pin unit so as to permit rotation of the positioning base relative to the leg unit about a second axis parallel to the first axis, that extends upwardly and frontwardly from the pivot pin unit, and that is movably connected to the backrest frame, the positioning mechanism further including an elong
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