| http://www.w3.org/ns/prov#value | - The reflecting array is such as to reflect portions of the symmetric Lamb wave 13 along a plurality of paths that extend across the touch surface 37 of the substrate perpendicular to the axis of the array 28 to a second reflecting array 30 wherein each of the parallel paths extending in the Y direction represent a different axial position with respect to the X axis as discussed below.
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