| http://www.w3.org/ns/prov#value | - A stiffening tape 169 is secured to the internal surface of a lower region of the whole wall 34 by bolts, rivets, staples or other wire or by a suitable adhesive, said tape extendingupwardly from the lowermost edge of the wall 34 throughout a distance which is between substantially 20% and substantially 40% of the height of the wall 34 in a direction parallel to the axis 19, substantially 30% of t
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