１４）鋳鋼銑鉄、鋳物製造業　第２表　生産実績規模、製品１個当り重量階級別生産量延労働時間およびトン当り所要労働時間（ねずみ鋳鉄）３－１、３－２、３－３ １４）鋳鋼銑鉄、鋳物製造業　第２表　生産実績規模、製品１個当り重量階級別生産量延労働時間およびトン当り所要労働時間（ねずみ鋳鉄）３－１、３－２、３－３

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