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Ruler, something quite familiar to us due to the
frequency we use it. We, however, can seldom take
it up smoothly in terms of the ruler is always attached
closely to the table, as a result we have no choice
but to take it up with our nails. With this consideration, we come up with an idea
that we can cut down a small part from the back
side of the ruler, afterwards with the incline, we
can take up the ruler easily just by pressing the
border of the ruler. Moreover, such a little change
will never influence the normal function of the ruler.
Jinrui Xu, Xue Pei, Tong Ren, Jin Zhang