| http://www.w3.org/ns/prov#value | - A preform polycrystalline diamond cutting element comprising a body with a workings surface, wherein a diamond density adjacent the working surface is substantially higher than elsewhere in the body, and is a substantially free of a catalyzing material to a depth of at least about 10 mm from the working surface, wherein the body comprises a plurality of bonded diamond crystals and an interstitial
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