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± pencil / pencil sharpener

± pencil
± pencil

+/- pencil

Specialized sharpeners are available that operate on non-standard sizes of pencil, such as the large art pencils used in primary schools. Sharpeners that have two holes, one for normal pencils and one for larger art pencils are still fairly common. Some mechanical sharpeners have a large hole with a rotating disk in front of it that has several holes of different sizes.

University

National Yunlin University of Science and Technology

National Yunlin University of Science and Technology
Yunlin Country, Taiwan

Ye,Bo-Xiong

Design

National Yunlin University of Science and Technology

National Yunlin University of Science and Technology
Yunlin Country, Taiwan

Feng,Cheng-Tsung Wang,Bo-Jin