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We alway need to clean the stopcock to prevent virus or flu germ on it, so we need waste water to do that. return the issue ,we can close the stopcock with clean the stopcock at the same time.
National Yulin University of S.&T.
Industrial Design
Douliou City, Taiwan
Professor. Wu-Fay Chang
National Yulin University of S.&T.
Industrial Design
Douliou City, Taiwan
Yu-Liang Shih
Yang-ching Tsai
Yu-Hung Shih