China mining drilling tools manufacturers Our History Located in Qingzhou City, Shandong Province, Qingzhou Aoerheng International Trade Co., Ltd. is a high-tech enterprise. For more than 20 years, it has focused on investment, consulting, design, manufacturing, assembly and operation management of environmental protection projects and technology research and development enterprise. We will offer full life service all the time.China mining drilling tools manufacturers website:http://www.qz-aoerheng.net/