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Yamada Kogyosho was founded in 1957 in Yokohama, Kanagawa Prefecture. Yamada Kogyosho is the only manufacturer in Japan making iron pots through hammering-out method, where craftsmen hammer an iron plate thousands of times as to form and shape. Hammered-out single-handled pot is popular by both amateur and professional users, so much that it is known as a representative product of Yamada Kogyosho.
https://www.shokunin.com/en/yamada/