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This doorknob is serviced for latrine.After you use the toilet and when you push the doorknob,you can open the door and at the same time the doorknob will also help you flush the toilet.


HuaQiao university

HuaQiao university
Xiamen, China

kun Chen,
HuaQiao university

Qixuan Chen,
HuaQiao university

Huijun Li,
HuaQiao university

Yuanzhi Huang,
HuaQiao university