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On the Origin of Clockwork, Perpetual Motion Devices, and the Compass

Note 3 — Front matter

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For the early history of gearing in the West see C. Matschoss, Geschichte des Zahnrades, Berlin, 1940. Also F. M. Feldhaus, Die geschichtliche Entwicklung des Zahnrades in Theorie und Praxis, Berlin, 1911.

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