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Ruler by rotation means to achieve extended indefinitely, and the magnet of the magnetic to rotation of the fixed, in order to avoid the line is not straight. The ruler is mainly composed of three parts, the first part is a finger pressing part, the second part is a ruler scale part, their contact positionand have two pairs of magnets. The third part is the rubber material, can increase the friction between the ruler and the paper surface, and will have a certain distance with the bottom surface, only when the first part is pressed, the rubber part will be in contact with the bottom surface.
Beijing institute of fashion technology