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.
We always encounter a small trouble about many articles for daily use.For example,when we use the ruler on the table,because the ruler and the table is difficule to fit the ruler to take up.By the side of the parallelogram shaped ruler of this design,after use press cailration for the dege ruler side tilt.This solves the problem of using a ruler on the desk is difficult to get.
Dalian Minzu University