| http://www.w3.org/ns/prov#value | - the apparatus includes a generally cylindrical, hollow, support-tube, of relatively rigid material, the support-tube having an upper end and a lower end; the apparatus includes an outer bladder, comprising an outer tube of stretchy elastomeric a material; the outer bladder is located outside the support-tube, its location being such as to create an annular outer space between the inside surface of
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