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.
In everyday life, when toddlers try to open doors they often have to face the problem of not being able to reach the doorknob due to their short body height. The purpose of the doorknob's design is to let children open doors easily.
Wang fuheng Zhou wensheng Liang huaimin Deng hailang