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How windmill - making, history, , processing, A windmill structure machine converts wind usable energy rotation wheel adjustable blades.. A windmill is a structure or machine that converts wind into usable energy through the rotation of a wheel made up of adjustable blades. Hand water pumps making comeback - prepper journal, Americans abandoned hand water pumps generation , today understand work limitations . pump principle changed. Americans abandoned hand water pumps more than a generation ago, few today understand how they work or what their limitations are. The pump principle has changed Pump - wikipedia, A pump device moves fluids (liquids gases), slurries, mechanical action. pumps classified major groups . A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the
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