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Have you been annoyed by taking along too many keys? This upgrade is to amazingly use one key to open four locks at a time. Just turn the part on the top of the key, four different locks will be opened up, which is absolutely handy.
Southwest Jiaotong University
School of Arts and Communication
Chengdu, China
Southwest Jiaotong University
School of Arts and Communication
Chengdu, China
Wang Zhaofeng; Wang Chunqi; Jiang Wenling: Ma Chunming