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convenient key ring / Daily supplies

convenient key ring
convenient key ring

Existing key rings have some problems when they were used, for example, during the process of installing, because of the thick key, sharp instruments and expanding angles are needed when open key ring. Our improvement is to make single ring become vaulted ring. This kind of improvement can solve the problem of opening key ring effectively, and keys can install easily, at the same time, practicability and safety can be ensured.

University

Xi`an Technological University

Xi`an Technological University
xi‘an, China