| http://www.w3.org/ns/prov#value | - The exemplary embodiments of FIGS. 2 to 4 show feasible shapes for the structure of the second electrical contact layer 50, which are composed of a central, in particular circular or square contact surface 51, and, arranged about said central contact surface 51, a grid structure that is rotationally symmetrical with respect to the center point of central contact surface 51 and is composed of relat
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