Application of PDC Bit to Shallow Hole Drilling in Chenfu Coal Field[J]. COAL GEOLOGY & EXPLORATION, 1988, 16(6): 69-71.
Citation: Application of PDC Bit to Shallow Hole Drilling in Chenfu Coal Field[J]. COAL GEOLOGY & EXPLORATION, 1988, 16(6): 69-71.
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Application of PDC Bit to Shallow Hole Drilling in Chenfu Coal Field

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