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1912年11月30日

1分钟阅读

矿工用电安全灯、自动车钩及更多

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 大众科学 Magazine Vol. 107 No. 22 (November 1912), p. 464
doi:10.1038/scientificamerican11191230-464a

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