| http://www.w3.org/ns/prov#value | - The elastic wall allows a fluid to be injected through itself, particularly through sites designed for this purpose: either two thickened membranes to be perforated with the aid of a hollow needle, or an injection device actually inserted in the mould when the elastic envelope is being manufactured so that the injection of this elastic substance in the mould ensures a perfect seal between the inje
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