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Triquetrous pencil / Pencil

Triquetrous pencil
Triquetrous pencil

We can chang the lead pencil by making the lead a triangular prism.then its section can be a triangle.which can bring us many advantages.first when the lead freted when we are writing,we can just chang a direction ,second we ofen have to whittle the lead to adjust our diffrernt use.but with this special lead we can easily find what we need

University

Zhejiang Sci-tech unversity

Zhejiang Sci-tech unversity
Hangzhou, China

Design

Zhejiang Sci-tech unversity

Zhejiang Sci-tech unversity
Hangzhou, China

Zhou hongfan,Wang xinying,Zhou qi,Chen xiang