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Portable coins / Coins Design

Portable coins
Portable coins

How to store scattered coins is always disturbing us.But if there is a kind of coins with hollowed-out design which can be easily stored by strunging togegher with ropes or key-chain, especially when there are a lot of coins which can be stacked up to save places as well as metals.

University

Southwest Jiaotong University

Southwest Jiaotong University
chengdu, China

wang chunqi,
Southwest Jiaotong University