... Co., Ltd., Wuyue Special & Rock Drill Steel Co., Ltd., Yanggu Sanshan Renewable Resource Recycle Co., Ltd. and Yanggu Sanshan Natural Gas Co., Ltd. ... in machinery, engineering construction, oil exploration, and energy supply construction. Yanggu Sanshan Renewable Resource Recycle Co., Ltd. is ... Wuyue Special and Rock Drill Steel Co., Ltd. Yanggu Sanshan Natural Co., Ltd. deals in the supply and trade ...