... Co., Ltd. ("SSG") was established in 2003. It consists of Shandong Rock Drilling Tools Co., Ltd., Wuyue Special & Rock Drill Steel Co., Ltd ... ., Yanggu Sanshan Renewable Resource Recycle Co., Ltd. and Yanggu Sanshan Natural Gas Co., Ltd. ... 2005 was 600 million Yuan. Shandong Rock Drilling Tools Co., Ltd. is one of the biggest production bases ...