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121/4"석탄에 대 한 PDC 비트 HM952XA 우물 드릴링에 대 한 드릴링 PDC 드릴 비트 내

석탄 광산, 철강 몸, 제조업체 드릴 비트, pdc 드릴 비트, 다이아몬드 드릴 비트, 사암 드릴링, 석유 드릴 비트


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