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Parallel Ruler / stationery

Parallel Ruler
Parallel Ruler

This is a secondary user can draw parallel lines parallel ruler. Slide ruler on top to keep the vertical ruler slide rails in the following ruler.

University

QILU UNIVERSITY OF TECHNOLOGY

QILU UNIVERSITY OF TECHNOLOGY
Jinan City, Shandong Province,, China

XIAOYUE WANG,
QILU UNIVERSITY OF TECHNOLOGY