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when you using bottle-opener, common bottle-opener must be used pull-up at bottom to upper direct. Then your wrist is too folding so your wrist get too much stress. To solve this problem i changed bottle-opener using direction. This opener can be used by pushing front direction by one hand. if you using this opener, your wrist has less stress, and free another hand.
Konkuk University
Industrial Design
Seoul, South Korea
Jung,Kang-fa
Jun-seop, Ahn
Gyung-gi do, South Korea