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It's hard to open a beer bottle without a opener.And pop-top beer cap has a bad influnce on beer's taste.
We redesign the cap by rebuilding the side of it to shape the cap as a gear wheel. A couple of bottles can gear into each other easily.Prise the bottle ,the cap will be opened.This design is brief and convenient.Also,it can encourages people chat with each other.
School of Mechanical Engineering