1. Beijing Compo Advanced Technology Co., Ltd. General Research Institute for Nonferrous Metals,Industrial Research Institute for Metal Powder Material, Grinm Group.,Beijing,China
2. Gripm Advanced Materials Co., Ltd.,Beijing Compo Advanced Technology Co., Ltd.,Beijing,China
3. Zhongshan Hanhua Tin Industry Co., Ltd.,Zhongshan,China
4. Grinm Group. Gripm Advanced Materials Co., Ltd.,Industrial Research Institute for Metal Powder Material,Beijing,China