| http://www.w3.org/ns/prov#value | - the length of tube, and, confined between the two envelopes, reinforcement made of a structure comprising a plurality of fibers or strips impregnated with a settable resin, including fibers oriented mainly in the peripheral direction of the preform, each fiber or strip extending over more than one turn and co-operating with adjacent fibers or strips by making contact therewith such that adjacent
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