What factories are there in Xi 'an?

Yellow River Machinery Factory, Dongfang Machinery Factory, etc. The factories in the east and north of Xi 'an are concentrated: there are national defense enterprises such as Yellow River Machinery Factory, Dongfang Machinery Factory, Huashan Machinery Factory, Kunlun Machinery Factory, Northwest Optical Instrument Factory and Qinchuan Machinery Factory. The factories in the east and north of Xi 'an are concentrated: there are national defense enterprises such as Yellow River Machinery Factory, Dongfang Machinery Factory, Huashan Machinery Factory, Kunlun Machinery Factory, Northwest Optical Instrument Factory and Qinchuan Machinery Factory.