| http://www.w3.org/ns/prov#value | - An improved patient support structure, comprising:(a) a frame, said frame including at least one articulatable section for varying the position of a patient lying on the support structure; (b) a plurality of elongated inflatable sacks atop said frame; (c) gas supply means in communication with each of said sacks for supplying gas to same; (d) control means associated with said gas supply means and
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