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analysis made by the head shape were cut knife, tension and friction. first, break the head was shaped head Qi head was shaped head when Sarkozy is a clear cut phenomenon, just as with a sharp pair of scissors to cut off the same neat stitches. in case this and other cases, we should first think of to find a cause of equipment, and this situation basically by the thread (the thread the needle by transporting more than that reflected in the front seam stitch suture material). in sewing machine, for

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