１２）鉄製錬業　第５表　転炉鋼総公称能力、一炉平均公称能力別生産量延直接労働時間およびトン当り直接労働時間１２）鉄製錬業　第５表　転炉鋼総公称能力、一炉平均公称能力別生産量延直接労働時間およびトン当り直接労働時間

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