| 摘要 |
A support construction includes two different-size sheets, the smaller one being sealed along all of its margins to the larger one, and the assembly is folded over, the smaller sheet being on the inside while overlapping margins of the larger sheet are sealed, in order to form a flat air compartment bonded by a liquid compartment having an upper and a lower portion. Additional seal points between the sheets establish obstructions for the liquid. An alternative form uses a flattened and folded lower sleeve. Valves permit filling of the compartments.
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