Od440mm Drilling Kelly Bar For Rotary Rig Hole Piling Rig

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Od440mm Drilling Kelly Bar For Rotary Rig Hole Piling Rig

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Od440mm Drilling Kelly Bar For Rotary Rig Hole Piling Rig

Elements 3/4/5/6 Material Q345B /Q460D / 27SiMn/35CrMo With Special Heat Treatment Spring 60Si2Mn Lock Type Interlocking / Frictional No. Diammeter of The First Section Sections Key Pressure Type ...

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od 440mm drilling kelly bar

hole piling rig drilling kelly bar

rotary rig kelly bar drilling equipment

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