Northwest Mining Machinery Co., Ltd. Ningxia Tiandi (formerly Northwest Co- al Mining Machinery Plant) is a subs- idiary of China Coal Technology & E- ngineering Group, a subsidiary of the World Technology Co., Ltd., is the cou- ntrys coal industry mining face conv- eyor sentinel manu acturers, enterpr- ises after four years of development h- as become the largest coal mine belt conveyor manufacturer.The company has 4 affiliated companies |