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STKM 機械構造用炭素鋼鋼管 - pipe-nikko.co.jp · STKM 13A 0.040以下 0.040以下 0.35以下 0.35以下 0.60以下 0.30~0.90 0.040以下 0.040以下 0.12以下 0.25以下
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