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Safety Tack / Safety Tack

Safety Tack
Safety Tack

Pull the rear of tack, and then the pin will be hid, it is going to reduce the dangers for people. The magnet in front of the tack that the pin be closed up, so it is not only on the bulletin board, but on the metal surface.


National Taiwan Normal University (NTNU)

National Taiwan Normal University
Taipei, Taiwan

Kai-Yu Wu Yu-Te Lin Cheng-Ta Chiang Jih-Kuei Fan

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