| http://www.w3.org/ns/prov#value | - The present invention has mainly been illustrated as to the preferred embodiments when applied to drill bits, but is of course useful for other uses, for example, cutting tools, drilling tools, dressers of grinding wheel and wear resisting tools, in particular, in the case where the joint area of a compact cutter and tool substrate is relatively small and the bond strength is lacking when the mate
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