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core bit for geology drilling

Pdc Drill Bit Reinforced Composite Sheet PDC Cutter Drag Drill Bit
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Geological Drill Bit
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No 66, Changming Road, Xi'an, Shaanxi Province, China
+86-029-82612068
+8615291688126
zuanlongbits@gmail.com
http://m.zuanlongbits.com/

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