| http://www.w3.org/ns/prov#value | - The figure is explained thus: This figure is a longitudinal partial cross section of a double casing pipe according to the invention, which hence comprises an inner tube 1 coaxially fitted inside an outer tube 2, in the form of a prefabricated item delivered from a production facility to be transported to the installation site where identical pipes are sequentially joined end to end to form a sub
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