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Safety Manhole Cover / Manhole Cover

Safety Manhole Cover
Safety Manhole Cover
University

Dalian Nationalities University

Dalian Minzu University
Dalian, China

Xinyue Zhang,
Dalian Nationalities University

Zhen Ye,
Dalian Nationalities University

Jie Zhang,
Dalian Nationalities University

Jiale Hou,
Dalian Nationalities University

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