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"Short Foot" after prolonged use inspired triangle edge portions easy to wear, resulting in the painting at right angles to a great error, and the triangle surface area, convenient to carry, therefore, this design uses a combination of methods, the overall parallelogram, immediately used alone, or in combination drawing straight lines, right angles. Ruler scale interior design is embedded in the ruler, positive and negative Jieyou scale, scale, black and red colors with distinction, both ends of the ruler special magnetic material, to ensure a reliable connection between the ruler.
Jilin City, China