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Shandong Yanggu Constant Crystal Optics, Inc tau tsim nyob rau lub Plaub Hlis 2006, nyob hauv Xiangguang thaj tsam kev txhim kho kev lag luam, Yanggu County, Xeev Shandong. Peb tshwj xeeb hauv kev tshawb fawb, tsim khoom thiabsaling optics thiab cov khoom siv kho qhov muag. Peb cov khoom tseem ceeb suav nrog lub qhov muag kho qhov muag, prism, lens, kab teeb, lim, npoo, qhov khoob thiab lwm yam .Peb kuj tseem muab cov kev pabcuam tshwj xeeb raws li cov neeg siv khoom thov

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