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This design mainly aims at the function change of tack, previous tack may not be nailed on the
solid material, but it brought some inconvenience to the user, so we will tack can be folded,
attached at the bottom with a powerful magnet, so that you can use tack for some panel,
can adsorption to nail some sticky notes, etc
Anhui University
Hefei, China
Kangnan Zhao,
Anhui University
Huanhuan Yuan,
Anhui University
Tingting Wang,
Anhui University
Shuhao Shan,
Anhui University
