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It is a traditional manufacturing method that has been passed down from the production of Japanese swords, among others. It involves heating soft iron and steel in a furnace and shaping them with a hammer to create the desired form. Unlike mass-produced blades, which often have molds, this method relies on the skill of the craftsmen to shape the blades according to sample models.

As a result, this method is not suitable for mass production like stamped blades, and the unit cost tends to be relatively high due to the lack of cost benefits from quantity. However, the absence of molds allows for the production of a wide variety of knives, which is a significant advantage.

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