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Keyhole-Design / keyhole design


Sometimes to insert a key into a small keyhole is difficult .This is a keyhole design. Around the keyhole is a concave which can make the whole process of opening the door moving on smoothly .
It is particularly good to the elderly and disabled people.


Jiangnan University

Jiangnan University
Wuxi, China

jie shen


Jiangnan University

Jiangnan University
Wuxi, China

huizhong zhang xinxin ma xinwei wang yuan kang