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| Global Geology
2023 26 (1):
40-46
ISSN: 1673-9736: CN: 22-1371/P |
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| Tooth arrangement design of retractable DTH hammer bit used for drilling while casing |
| ZHANG Boyao, CHEN Baoyi* , YANG Da, BO Kun and CAO Pinlu |
| College of Construction Engineering, Jilin University, Changchun 130061, China |
| Received null Revised null Online 2023-02-25 |
| Reference null |
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| Corresponding author: |
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