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Improvements of Different Diameter Connection of Double-barreled Double-acting Boring Tool
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P634.4

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    Abstract:

    The paper mainly introduces the improvement on different diameter connector of double-barreled and double-acting coring tool in Hengshui hydrogeology scientific drilling with the improving’s effects.

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History
  • Received:September 30,2009
  • Revised:September 30,2009
  • Adopted:December 08,2009
  • Online: February 04,2010
  • Published: January 25,2010
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