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  • JCDRILL Cov Khoom Siv Daim Ntawv Thov

    JCDRILL Cov Khoom Siv Daim Ntawv Thov

    QUARRIES THIAB MINES Ntau daim ntawv thov mining: 1. Surface mining 2. Underground soft rock mining 3. Underground hard rock mining 4. Production drilling of blastholes in quarries and mines.Muaj plaub hom blasth...
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