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"Wind flap brake assembly for wind turbine description/claims." Wind flap brake assembly for wind turbine description/claims. Web. .
Wind is a powerful renewable energy source that citizens have used to varying degrees for thousand of years. also Historians gave credit to ancient Mesopotamia and Egypt as giving rise to sail-based propulsion systems for boats, while most accounts accredit ancient Persia as having developed and implemented windmills in 500 to 900 AD.