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Legendary swordsmith who supposedly created the first single-edged longsword (tachi) with curvature along the edge in the Yamato Province around 700 AD

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They are made of the purest steel, wood, leather and cotton

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 The katana was made in Japan, Seki, Gifu

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 The katana was made in Japan, Seki, Gifu

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Katanas were made for practising several martial arts and war

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Katana are usually made of a specialized Japanese steel called tamahagane, which is created from a traditional smelting process that results in several, layered steels with different carbon concentrations. This process helps get rid of impurities and even out the carbon content of the steel.

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The metals to make the katana were made in Konomai, Kato, Todoroki, Tashiro and Hokusatsu

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The first katana was made in the 15th century but early versions of the katana appeared in the late 13th century

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Creating a saya begins by selecting an appropriate block of wood, sawing or splitting it into halves, and carving out each half to guide the blade smoothly. Carving is done with purpose designed chisels called saya-nomi .