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Three-in-one Lock is a multi-function lock. It integrates magnetic door stopper and hook with less parts and more function.
When moved from the bottom of the door to the lock position, the magnetic door stopper become Three-in-one Lock.
The red part is a rubber washer. It can reduce the knobs impact to the hook. Meanwhile, it is a staring signal to alarm people the existing of the hook.
Anhui University of Technology
Ma Anshan, China
Huji Leng，Qi Yang
Feng Liu , Xin Xu