[by] Ministry of Labour, the Research Institute of Industrial Safety, translated by Technical Institution of Industrial SafetyTechnical Institution of Industrial Safety1980.10<ND311-B1>
National Diet Library
Note (General)..., Japan 原タイトル: 産業安全研究所技術指針 : 工場電気設備防爆指針(ガス蒸気防爆1979)