Sign up for
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.
Watch the safety hammer safety hammeris cleverly designed on watch.Watch the middle sag.Needle design safety hammer in table central.Usual and normal watch.When confronted with danger need broken sindows.Only need to watch the surface force on windows smashed.Concave portion protruding hammer needle break the glass.
College of Science&Technology
school of software technology zhejiang university
anli xue, menrong hou,