YIHO keeps close relation with many of industrial and commercial enterprises, engineering and research institutions, construction companies and research universities in china, as a jointment of technology, manufacturing and trade business.
●China United Engineering Corporation
●Hualu Engineering Corporation.
●China North Industries Corporation
●Haohua Chemical Science &Technology Corp.,Ltd
●Liming Research Institute of Chemical Industry
●Southwest Research&Design Institute of the
●Hangzhou Hangyang Co.,Ltd
●Sichuan Air Separation Plant(Group) Co.,Ltd
●Zhejiang Supcon Technology Co.,Ltd
●Hanwha Power Systems CO.,Ltd.