Examination of marks on duplicate milled groove keys
Zhou Meng-zhe · Xingshi jishu · 2013
Objective To study the characteristics of marks on duplicate milled groove keys.Methods Different milled groove keys were duplicated by different machine and people,and then the marks on duplicate key was observed under microscope.Results On the duplicate key,the added marks were found,which are different from manufacture marks and use marks on original key.The characteristics of marks were affected by key material,configuration,duplicating machine,the people who manipulate the machine.Conclusion When the duplicated marks on a milled groove keys weren't been found obviously,it can't leap to a conclusion that the key is the original key.