| http://www.w3.org/ns/prov#value | - Means are provided for securing the exterior shell wall over the assembly to rigidify the shell. [0038] The interior shell wall is preferably composed of relatively rigid material such as a sheet of plastic or hard rubber, or of a plurality of articulately connected sections of plastic or the like or metal sections. [0039] The inner layer is preferably comprised of fabric, felt or sponge like mate
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