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Nowadays the appearance of thumbtack is nothing special. And there is no protection on the
needles so that people are easily hurt. The design of propelling pencil is inspired by propelling
pencil. It not only can prevent people from getting hurt when they fetch the thumbtacks, it can
also reserve energy, provide conveniences and safety for users.
Tatung University
Taipei, Taiwan
Tatung University
taipei, Taiwan
Shuyu Kuo
Tzulin Fu
Tatung University
taipei, Taiwan