| http://www.w3.org/ns/prov#value | - The outer tube 11 is devoid or windows, holes or other types of openings in contrast to the inner tube 12 which is provided with windows developing as a result of inwardly bending portions of the tube 12 so as to form means 13 for locating the sleeve-like guide 8 in the coaxial lumen 7 of the tube 12.
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