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Design description:This is rule which can be used to draw vertical lines. There is a thin oblong open hole in the middle of the ruler ,with red lines relatively perpendicular to its both ends. You can draw an absolutely precise vertical line when the red line coincides with any horizon line on drawing. This kind of ruler is the combination of ruler and set square with multipurpose.
XI`AN UNVERSITY OF SCIENCE AND TECHNOLOGY college of the Arts
108 Industral Design Team
Xi'an, China
siyu Wu,
XI`AN UNVERSITY OF SCIENCE AND TECHNOLOGY college of the Arts
