"A windmill is a structure that converts wind power into rotational energy by means of vanes called sails or blades,
specifically to mill grain (gristmills), but the ...
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term is also extended to windpumps, wind turbines and other applications.
Windmills were used throughout the high medieval and early modern periods; the horizontal or panemone windmill first appeared in Greater Iran during the 9th century, the vertical windmill in northwestern Europe in the 12th century." - (en.wikipedia.org 06.01.2021)
