Jiangsu Longsheng Drilling Machinery Manufacturing Co., Ltd. (former Jiangyin Longcheng Drilling Machinery Manufacturing Co., Ltd.) was founded in 2006. Is located in Jiangsu Economic Development Zone in Changshou City Province, is the first use of fully enclosed multi die forgingtechnology for the production of oil drill pipe and oil pressure valve professional manufacturers,multidirectional forging process closed to fill the domestic blank. The company existing staff...