| http://www.w3.org/ns/prov#value | - It will generally be about 50 ??m thick, of rigid or semi-rigid material, e.g. a plastics material, rubber or an extruded metal, and may be either a continuous layer or a layer of varying thickness, with point or line contact with adjacent layers, e.g. with shaped particles such as pyramids 14 a, semi-spheres, or sintered spheres 14 b, so as to emphasize the temperature difference between optimum
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