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This circumstance offen happens in our lives, that we may forget whether we lock the door or not. This design can solve this problem by a rotatable key head. When locking the door, the key will turn 180 degree and then get strained. In this progress, the "LOCK" sign appears so we can easily know if we have already locked the door by looking at the key.
Hubei University of Technology
School of Arts & Design
Yi Miao Wei Gao Binbin Ding Da fei Yu