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1912年11月30日

1分鐘閱讀

礦工用電安全燈、自動車鉤及更多

作者：Robert G. Skerrett

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This article was originally published with the title “An Electric Safety Lamp for Miners, Automatic Car Coupler, and more” in 大眾科學 Magazine Vol. 107 No. 22 (November 1912), p. 464
doi:10.1038/scientificamerican11191230-464a

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