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Parallel ruler / Ruler

Parallel ruler
Parallel ruler

People need to draw two parallel lines with two rulers or other tools,which
may be inconvenient,parallel ruler simplifies this tedious steps, and it can
plot the distance between the two parallel lines.

University

Xiangtan University

Xiangtan University
Xiangtan, China

Chen Xingxu,
Xiangtan University

Luojian,
Xiangtan University