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Look at bin's cap is made by the material of the trash that its collecting. Therefore it directly shows where to throw your trash. Also it tells how to separate your trash if it's made out of multiple materials.
Keimyung University, Yeungnam University, Daegu University, Kumoh National Institute
Daegu, Gyeongsan, Daegu, Gumi, South Korea
Korea Desin Membership
Deagu, South Korea
Byungsung Song Hwajin Ock Jinhee Jang