No.203 Yizhuang Development Zone Popularity Ranking Beijing No.3 Plumbing Devices Materials No.3 Nai Huo No.3 Plumbing Systems No.5 Jian Zhu Jie Gou No.7 Water Supply and Drainage Engineering No.7 Water Supply and Drainage Design No.7 Water Supply and Drainage No.7 Dian Ci Jian Rong No.9 Ya Li Pipes Road No.11 Chemicals Materials No.11 Ya Li Rong Devices No.12 Coal Chemicals 常务理事单位 理事单位 高新技术企业 国家知识产权优势企业 企业技术中心 知识产权示范企业