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References
- ↑ Gerhard Dohrn-van Rossum, History of the Hour: Clocks and Modern Temporal Orders
- ↑ Hill, P. (2012). "Clocks". The Book of Knowledge of Ingenious Mechanical Devices. Springer. p. 271. ISBN 9789401025737.
- ↑ Ahmad Y Hassan. "Al-Jazari and the History of the Water Clock". Archived from the original on 22 December 2006.
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