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Handy ruler / Office

Handy ruler

This is mainly designed for our study does not draw a parallel line drawn parallel to the problem. Traditional rotatable ruler processing, so that it can move up and down, and on the structure to solve the traditional non-rotatable securement paper ruler drawbacks.

University

Jangxi University of Finance and Economics

Jangxi University of Finance and Economics
NanChang, China

Hui Huang,
Jangxi University of Finance and Economics