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Everyone has experiences that pricked it on the pin. The pins devise the sharp nail to fix the memo, however when we use it very dangerous things. Pin-cap protects a user by covering the silicon on the top of pin.
Yonsei University
Wonju, South Korea
Silla University
Gyeongsangnam-do, North Korea
kyungwon University
Gyeonggi-do, South Korea
Hongik University
Seoul, South Korea
Yonsei University
Gyeonggido, South Korea
