... 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. Our Group ... Undertaking Unit", "Shandong Province High-New Technical Enterprise", "Shandong Top-Star Enterprise of China Patent", "AAA Credit Enterprise", and "Shandong Province ...