Four engine compounding arrangement for drive shaft of a rotary drilling rig and two mud pumps

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  机译： 旋挖钻机的钻杆泥浆轴，旋挖钻机的冲击桩

• 4. MUD SHAFT FOR THE DRILL STRING OF A ROTARY PERCUSSIVE DRILLING RIG, IMPACT STACK FOR A MUD SHAFT AND ROTARY PERCUSSIVE DRILLING RIG [P] . 欧洲知识产权局专利： EP2029851A1 . 2009-03-04

  机译： 旋挖钻机的钻杆泥浆轴，旋挖钻机的冲击桩

• 5. MUD SHAFT FOR THE DRILL STRING OF A ROTARY PERCUSSIVE DRILLING RIG, IMPACT STACK FOR A MUD SHAFT AND ROTARY PERCUSSIVE DRILLING RIG [P] . 世界知识产权组织专利： WO2007134478A1 . 2007-11-29

  机译： 旋挖钻机的钻杆泥浆轴，旋挖钻机的冲击桩

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