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2004 09. 30. JISB2311 一般配管用鋼製突合せ溶接式管継手のﾃﾞｰﾀの面取りについて
2004 09. 30. JISB2311 一般配管用鋼製突合せ溶接式管継手のﾃﾞｰﾀの面取りについ