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電力周波數を60サイクルに統一する場合各種産業に及ぼす影響と其對策
電力周波數を60サイクルに統一する場合各種産業に及ぼす影響と其對策
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障害者向け資料あり
電気協同研究会周波数統一專門委員会産業部会 [著]
電気協同研究会
1950.8
<ND181-H27>
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National Diet Library
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