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Betz's law is published in 1919, by the German physicist Albert Betz. It indicates the maximum power that can be extracted from the wind, independent of the design of a wind turbine in open flow. It indicates the maximum power that can be extracted from the wind, independent of the design of a wind turbine in open flow.
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An Encyclopedia of World History (5th ed. 1973); highly detailed outline of events online free; Morris, Richard B. and Graham W. Irwin, eds. Harper Encyclopedia of the Modern World: A Concise Reference History from 1760 to the Present (1970) online; George Henry Townsend (1867), "Germany", A Manual of Dates (2nd ed.), London: Frederick Warne & Co.
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The Revolution of 1918/19 is one of the most important events in the modern history of Germany, yet it is poorly embedded in the historical memory of Germans. [137] The failure of the Weimar Republic that the revolution brought into being and the Nazi era that followed it obstructed the view of the events for a long time.
The territorial evolution of Germany in this article include all changes in the modern territory of Germany from its unification making it a country on 1 January 1871 to the present although the history of "Germany" as a territorial polity concept and the history of the ethnic Germans are much longer and much more
Germany is traditionally a country organized as a federal state. After the dissolution of the Holy Roman Empire in 1806, the German-speaking territories of the empire became allied in the German Confederation (1815–1866), a league of states with some federalistic elements.
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