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83/4" HS642XA API و ISO فولاد بدن PDC بیت مته برای حفاری چاه نفت

PDC مته بیت فولاد بدن بیت 6 تیغه کمی تمرین متوسط تمرین نرم بیت، روغن خوب تمرین بیت,


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