Are three sided blades illegal? – Roadlesstraveledstore
A fuller is a rounded or beveled longitudinal groove or slot along the flat side of a blade (e.g., a sword, knife, or bayonet) that is made using a blacksmithing tool called a spring swage or, like the groove, a fuller. A fuller is often used to widen a blade. This effect lessens as the blade is reduced in length.
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