coal drilling meaning in English

煤层钻进
煤田钻井

New electric leakage protection device of electric coal drill
一种新型的煤电钻漏电保护装置
Problems and countermeasures of electric coal drill comprehensive device
煤电钻综合装置的问题及对策
Flameproof hand - held electric coal drill
隔爆型手持式煤电钻
Flame - proof rapid interruption geb for underground coal drills
煤矿用隔爆型快速断电煤电钻综合保护装置
Diamond core bit for coal drilling
煤田钻探金刚石取心钻头

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