a very similar procedure of production. Damascus steel uses welded wires while Japanese used multiple layers of steel of different density and elasticity
Making a super sword is not enough. These days you would probably use a titanium alloy for that purpose. But even a super sword in the hands of an incompetent swordsman would be a waste of resources
Moreover I wouldn't like to use a sword- even a super sword- against a guy with a machinegun
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