| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS [0036]FIG. 1A is a schematical cross sectional view of a ring of a device of the invention. [0037]FIG. 1B is a schematical cross sectional view of a portion of a ring of a device of the invention, wherein the portion comprises a bore which runs from the surface of the portion, into the ring, and intersects the surface of the portion twice. [0038]FIG. 2 is a graph
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