Rotary drilling machine, also known as pile driver. It is a comprehensive drilling rig, for its usage of a variety of bottom layers, the characteristics of fast forming layers, less pollution, and strong mobility.
[pdf] Why do we dare to say that our kelly bar are the best in China? First of all, it is because of our strict control on the material. When it comes to materials, we never cut corners. The first two sections of kelly.
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