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表 目 次 NS形 ダクタイル鋳鉄管...表14-NS形 ダクタイル鋳鉄異形管(1) 呼び径75~250 5 3 D D P 2 D V 30.4 A A 断面A-A a) b) 118 JDPA G 1042 単位 mm
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