Patents
一种构造煤大口径成井双向往复式钻进三级扩孔钻具及钻孔方法
- Disigner of the Invention:caoliwen,郭玉良,郝江涛,蔡念,丁远大,原俊红
- Type of Patent:国内
- State of Patent:专利授权
- Application Number:201711332283.X
- Number of Inventors:7
- Service Invention or Not:no
- Application Date:2017-12-13
- Authorization Date:2019-07-02
- First Author:sangshuxun
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