Why do box cutter knives have those diagonal lines on the blade

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CANARY Heavy Duty Box Cutter Retractable Blade, Safety Corrugated Cardboard Cutter Knife, Made in JAPAN, Green (DC-25) - Utility Knives

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Why is the classic folding/switchblade stiletto knife's guard S-shaped? - Quora

Why don't machetes have foldable handles like those on folding

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The Purpose of Knife Blade Shapes and Geometry

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