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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
School of Design
Wuxi, China
jie shen
Jiangnan University
School of Design
Wuxi, China
huizhong zhang
xinxin ma
xinwei wang
yuan kang
