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safety hammer watch / safety hammer watch

safety hammer watch
safety hammer watch

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

College of Science&Technology
Ningbo university
ningbo, China

xiaoliang zhao,
school of software technology zhejiang university

anli xue, menrong hou,

lei shi

junjie feng