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It is difficult to pick up a coin from a flat
surface because the coin itself is too thin.What we did is changing the shape of the edge of the coin from right angle to bevel.
Now when you want to pick up a coin,just
press the edge and the other side of the coin will be tipped up.In this way it’s easier to pick it up.
Polytechnic University of Turin
Shen Yue Liu Yuanyuan