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6 1/2" PDC rock bits tungsten carbide drilling machine for oil drilling

Hebei Ranking Bit Manufacture Co.,ltd.

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20" IADC537 new big size hole opener bit/reamer/Assemble reamer bits for rock drilling horizontal directional

Hebei Ranking Bit Manufacture Co.,ltd.

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6 3/4" IADC217 big size hole opener bits with tricone rock drill bits

Hebei Ranking Bit Manufacture Co.,ltd.

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