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Compared with the same kind of products, this one made some improvements based on the market orientation and problems collected from users. As every inch of this product is studied according to man-machine engineering theory, it uses more comfortable with hands. The improvements of the product is mainly in two aspects. On one hand, the back of the saw is added a pressed button which functions similarly like the one in an umbrella, making it convenient for opening or withdrawing the saw. On the other hand, the knob loading the blade is improved. It is screwed into the handle, to avoid hand injuries while using the saw. The product is named as