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This tag could help blind person shopping in supermarket uesful. How many days the commodityhas,
and it will have how many bumps on the tag.With the day goes by, thoes bumps will disappear one
by one. When blind person touch the tag, and he can know that how many days does the commodity
will overdue.
Nanjing University of Arts
Nanjing, China
Nanjing University of Arts
Nanjing, China