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Tamahagane, the material for Japanese swords, and how to make knives. A couple's work.
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The Process of Manufacturing Giant Springs A Spring Factory in China
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「日本刀製作技術」河内道雄［刀匠名］國平 普及用映像「青く冴えた鉄を鍛える 河内國平」
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The world is amazed! TOP 10 Perfect Korean Processes!
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the secret world of the japanese swordsmith
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The process by which a traditional craftsman hammers silver 100,000 times to create a cup.
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