Kelly Bar, DTH Hammer, Foundation Construction manufacturer / supplier in China, offering High-Quality Used Friction Interlocking Kelly Bar for Rotary Drilling, Bauer Kelly Bar of Sw for Drilling Rig Bg36 with Steel Tube<Y. S 800+ MPa&T. S 980+ MPa>, Sw High-Strength Kelly Bar for XCMG Drilling Rigs - Low Headroom Design and so on.
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