device for directional drilling of boreholes in coal

• 1. 一种煤矿井下定向钻分支孔钻进装置及钻进方法 [P] . 中国专利： CN111677450A . 2020-09-18
• 2. 煤矿井下定向钻进随钻水力造穴装置、钻进系统及方法 [P] . 中国专利： CN111677451A . 2020-09-18
• 3. device for directional drilling of boreholes in coal [P] . SU144797A1 . 1961-11-30

  机译： 煤矿井眼定向钻进装置

• 4. SHAFT ALIGNMENT DEVICE, ALIGNMENT DEVICE OF DIRECTIONAL DRILL, AND METHOD FOR DRILLING DIRECTIONAL BOREHOLE [P] . 日本专利： JPH09217576A . 1997-08-19

  机译： 轴对准装置，方向钻的对准装置以及方向钻孔的方法

• 5. Directional borehole drilling device uses radially adjustable steering head incorporated in driven drill rod for determining drilling direction [P] . 德国专利： DE19923555C1 . 2000-11-02

  机译： 定向钻孔装置使用从动钻杆内置的径向可调转向头确定钻孔方向

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• 8. Cost-benefit analysis of water source improvements through borehole drilling or rehabilitation: an empirical study based on a cluster randomized controlled trial in the Volta Region Ghana [O] . Seungman Cha, Yinseo Cho, Sharon Jiae Kim, 2018
• 9. The Underground Directional Drilling Technology and Equipments for Kilometer Deep Borehole with MWD in Coalmine [O] . Shi Zhijun, Dong Shuning, Yao Ningping, 2011
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