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Blades are one of the oldest tools of humanity and have been used in combat, food preparation, and other purposes.
The blade can be made of materials such as flint, metal (usually steel), ceramic, or other materials.
A blade is a part of a cutting tool, weapon, or machine whose edge is designed for piercing, cutting, or scraping material surfaces.
In mechanical engineering terminology, blades often refer to sheet-like parts installed on machines for cutting.