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Compass is composed of a pen head, a rotating shaft, a compass leg, ruler, folding leaf, a pen body, a pen nib, a compass point, a small ear constitute, it's written at the lower end of the insertion connected at the upper end of the pen body, the thread at the lower end of the pen body is connected at the upper end of the pen, small ears flat side is welded in the middle of the outer side of the supporting legs of the compasses, compasses legs at the lower end of the clamping connection in the compass point at the upper end of the.
Its characteristic is: the pen is stuck on a side of the connection in the folded leaf side, folded leaves the other side is pasted in the middle of one end of the ruler is connected, the pen is caught between two sides of the upper end of insertion connected at both ends of the rotating shaft and body of the rotating shaft sheathed connection in the upper end of the supporting legs of the compasses.
