Application Development and the Achievements of Air DTH Hammer Drilling Technology in Henan

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Application Development and the Achievements of Air DTH Hammer Drilling Technology in Henan
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Abstract:

With the full and accurate records, the paper reviewed the course and development achievements of the introduction and application of air DTH hammer drilling in Henan geological exploration industry since 1980’s.

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Received:May 05,2011
Revised:September 20,2011
Adopted:November 03,2011
Online: January 10,2012
Published: January 25,2012

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