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Surely it has accured for you one time that you celphone falls down from your hand and it damages
Cat Landing is a simple and functional concept for this problem. It makes cellphone fall down on special corner, each time that it releases from the user’s hand. we can do this with using bumper material like highdensity PVC on that special corner. If the cellphone’s center of mass locates exactly on that corner, each time that it releases from user’s hand, the bumper corner falls down before the other corners
Iran university of science and technology