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1920年3月20日

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驾驶员的手势信号，打破邮件飞机等的传统

作者：Robert G. Skerrett

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This article was originally published with the title “Finger Signals for the Motorist, Breaking Away from the Conventional in Mail Airplanes, and more” in 大众科学 Magazine Vol. 122 No. 12 (March 1920), p. 305
doi:10.1038/scientificamerican03201920-305

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