| http://www.w3.org/ns/prov#value | - The abrasive disc of fig. 3 is similar to the disc of figs. 1 a-b, but where the rim portion 14 of the grinding layer that radially extends further outward than the base layer has a larger thickness than the central portion of the grinding layer, i.e. the side of the grinding layer opposite the grinding surface includes a recess of a size and depth suitable for receiving the base layer and to prov
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