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A technician tests an AC driver at the Shandong Xinfengguang Electronic Technology Co Ltd in Wenshang county of Jining city, Shandong province, Sept 2, 2012. The company is a professional manufacturer of electronic technology products, capable of producing AC drivers of all types. By the end of 2009, the capacity of AC inverters produced and sold by the company exceeded 5 million kilowatts, saving major coal resources for the country.  [Photo/chinadaily.com.cn]