| http://www.w3.org/ns/prov#value | - The improvement defined in claim 9, wherein said serrated edge forms first and second edge portions which are perpendicular to said path of travel but displaced with respect to each other in the direction of said path of travel by a distance D such that the difference in delay provided by said pad at said first and second edge portions, respectively, is n???180???, where n is an odd integer.
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