CMJ17HTS twin powered crawler drilling Jumbo CMJ17HTS twin powered crawler drilling Jumbo Product introductionDesigned and manufactured by Zhangjiakou Xuanhua Huatai Mining & Metallurgical Machinery Co. Ltd., CMJ17HTS twin powered crawler drilling Jumbo is mainly used to drill blastholes for tunneling constructions in coal mine, metal mine, non-ferrous metal mine, hydro-power station, railroad, ...