81/2" HM662XA Manufactuer PDC सा हीरा PDC ड्रिल में बिट्स रॉक कोयला खदान के लिए उपकरण ड्रिलिंग
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81/2" HM352XA High Quality Center tom chaw tsim tshuaj paus Standards PDC laum ntsis rau Directional Drilling |
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