E3S Web of Conferences

Analysis on the Trend of Sewage Treatment Technology Patent in Dalian, China

Fengying Huang, Yubo Cui, Wanjun Zhang, Luosang zhuma and Zhongwei Zhang

E3S Web Conf., 194 (2020) 04006

Published online: 15 October 2020

DOI: 10.1051/e3sconf/202019404006

Fengying Huang

Yubo Cui

Wanjun Zhang

Luosang zhuma

Zhongwei Zhang

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