机械计算器 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "机械计算器" in Chinese language version.

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Prof. René Cassin, Pascal tercentenary celebration, London, (1942), Mechanical calculator（英语：Mechanical calculator）
Mechanical calculator（英语：Mechanical calculator）, p. 48
Mechanical calculator（英语：Mechanical calculator） p. 133 (1925)
Mechanical calculator（英语：Mechanical calculator） p. 23 (1925)