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Key-sorter is intended to simplify the complex and confusing experience of finding the right key to the right door out of numerous keys. The keys are placed in a holder the size of a credit card with each room marked on the back . You could put it in your wallet and take it out whenever needed. It is both convenient to take and easy to recognize.
Wuxi city, China
Xianjun Geng, Xuyang Guo, Chuansheng Du, Yanhua Yu