| http://www.w3.org/ns/prov#value | - The extruder head 3 represented schematically in the figures is a head of the well known double layered type, enabling to form on the conductor 7, in a single extruding operation through two successive dies surrounding the conductor 7, a sheath of synthetic material comprising an inner layer 81 and an outer layer 82 which may be of different colours, but of which only the outer layer 82 is visible
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