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| Global Geology
2009 12 (1):
36-39
ISSN: 1673-9736: CN: 22-1371/P |
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| Study on drilling mechanism and optimization of percussion-extruding DTH hammer bit |
| LUO Chunhong, ZHENG Zhichuan and CAO Pinlu |
| College of Construction Engineering, Jilin University, Changchun 130026, China |
| Received null Revised null Online 2009-03-25 |
| Reference |
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| Corresponding author: |
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