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83/4 "HS662XA 6 ريش حفر بت، بت PDC الجسم الصلب، API القياسية

PDC الحفر، الصلب الجسم حفر بت، 6 مثقاب بليد، حفر لينة متوسطة بت، النفط حفر بت،


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