N'ime afọ ndị na-adịbeghị anya, nkà na ụzụ na-egwupụta ihe na-aga n'ihu nke ukwuu, na otu n'ime ihe ọhụrụ ọhụrụ na-eme mgbanwe a bụ onye na-emepụta PDC. PDC, ma ọ bụ polycrystalline diamond kọmpat, cutters bụ ụdị nke mkpọpu ngwá ọrụ na-eji ngwakọta nke diamond na tungsten carbide iji melite arụmọrụ na du ...
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