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One Line / Utility Knife

One Line

Knife would blunt after several use, but we wouldn’t find out until the paper was broken, so make a red line at the edge of blade, so it can help us to discriminate the blade is broken or not.

University

DA-YEH University

DA-YEH University
New Taipei City, Taiwan

ZE-MIN HUANG,
DA-YEH University

ZIH-YIN CHEN,
DA-YEH University