Qhov chaw ntawm Keeb Kwm: Suav teb Hom Lub Npe: JCDRILL Qauv nab npawb: Q QU W Hom: Drilling cuab yeej Khoom siv: Hlau Siv: Mining, Kev Tsim Kho, Geotechnical, Kev Tshawb Fawb Lub npe: dej swivel