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The ruler / The ruler

The ruler

A method that makes the straightedge easier to be pick up.A small conner of ruler cocked, and the ruler is very easy to be picked up.

University

Shandong University of Science and Technology

Shandong University of Science and Technology
Qingdao, China

Mingming Xue,
Shandong University of Science and Technology

Ran Zhuo,
Shandong University of Science and Technology