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Wu Zhongyuan, 22, a local farmer, turns the wooden rotor blades of his self-made helicopter in preparation for its maiden flight, in Jiuxian county, Henan province, China, August 1, 2009. The local government later halted Wu's flight out of safety concerns. The aircraft, powered by a 150cc engine, took Wu two months to build and cost more than 10,000 yuan ($1,460), China Daily reported. 

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An Interesting Collection of Chinese Inventions
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