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9 1/2Inch 240mm API Standard TCI tricone khoom rau brehole drilling
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7 1/2 Nti 190.5mm Tci Tricone Cov Khoom Siv Rau Drilling
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6 1/2Inch peb tis pob zeb rau cov menyuam TCI tricone khoom rau kev tsim kho nyuaj
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6 3/4 Nti Hoobkas Nqe Tricone ntsis / dej Drill Bit Kev muag khoom
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6Inch Tci Tricone Laum Ntsis 152mm High Efficiency Dej Zoo Roj Tshawb Nrhiav Tricone Laum Bit
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5 1/2 Nti Iadc 537 Tci Tricone Drilling Pob Zeb Rau Nruab Nrab Hard Formation
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12 1/4 "311mm API tus qauv TCI pob zeb rau cov menyuam khoom rau pob zeb zoo drilling
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3 7/8 Nti Tungsten Carbide Ntxig Tricone Bit Rau Dej Dej thiab Tub Ntxhais Drilling