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岩石钻孔设备 冲击凿岩锥形连接钻杆和可拆式钻头
详细信息   
文摘
Lays down the basic dimensions of drill rods and the necessary dimensions of the tapered connections. These dimensions shall comply with those given in figure 1 and table 1 and in figure 2 and table 2, respectively.

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