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Aug 15, 2015 . "For example, on wind energy, we get a tax credit if we build a lot of . the mining of the ores for iron and steel, or crushing of rocks to make.

How Do Grain Windmills Work? | Sciencing

Apr 24, 2017 . Since ancient times, windmills have been used, primarily as a method of . The blades of the windmill--of which there can be four, five, six or . Devices Used to Harness Wind Energy · How Does a Rock Crusher Work?