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Kelly
Self-Lock Type Coring Tool
Drilling Jars
Mill
Core Bit
Mill Shoe
Keyway amplifier
Reversing Joint
Drill Collar
Lifting Sub
Email: zdyk66@163.com Minghu Building, No.24 Huangsi Street, Xicheng District Beijing
Email: zdyk66@163.com
Minghu Building, No.24 Huangsi Street, Xicheng District Beijing
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