| http://www.w3.org/ns/prov#value | - achment means for said upper back support rod comprises: means defining a threaded opening in each end of said upper back support rod; a mechanical fastener for each tube, each fastener including a head and a threaded shank, said shank having a diameter small enough to fit within the interior cross-sectional dimensions of its respective tube, and the threads thereon cooperating with a said threade
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