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1921年5月14日

1分鐘閱讀

保持我們的鐵路達到標準

構成幹線鐵路維護主要因素的氣動裝置

作者：Robert G. Skerrett

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This article was originally published with the title “Keeping Our Railroads Up to the Mark” in 大眾科學 Magazine Vol. 124 No. 20 (May 1921), p. 384
doi:10.1038/scientificamerican05141921-384

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