Sign up for an Award
Participate with your entry in one of our professional or student awards.Sign up for an award
You are using an outdated browser. Please upgrade your browser to improve your experience.
Where is the lock? You should find the lock before you lock the door , but the person who opened the door couldn`t tell you every time where the lock he put it on. Is there one way to make locking to become a simple thing? Yes. A simple combination of a lock and door handle make people convenient to lock the door . At the same time, the person who open the door shouldn`t consider the problem where he should put the lock?
Hua Cao Tuo Wang Mengdi Shi Tao Hu