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The dot is in the bank card on the tail, can not only increase the friction, but also can play the role of tips. Can let us take bank card in the wallet at the dot will be able to more handy to come up with. When a blind person uses a bank card, the positive and negative and the insertion direction of the card can be resolved through the dot.
Jangxi University of Finance and Economics
NanChang, China
Tian Wu,
Jangxi University of Finance and Economics