| http://www.w3.org/ns/prov#value | - Layer 70 is provided with a flat major face 72 and a curved major face 74 such that the major faces 74, 84, when joined by a suitable adhesive or by heat treatment or other techniques, the otherwise planar face 84 of layer 80 is caused to assume the curved configuration of the surface 74 of layer 70.
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