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91/2" HS952XA chất lượng tốt API số kỹ thuật thấp nhất giá dầu khí thép cơ thể PDC khoan bit

thép cơ thể khoan, chất lượng tốt, giá thấp nhất, petroelum khoan bit, hard rock khoan chút, đá khoan bit, pdc khoan chút chút khoan kim cương


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