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Shandong Yanggu Constant Crystal Optics, Inc yakavambwa muna Kubvumbi 2006, iri muXiangguang kusimudzira hupfumi, Yanggu County, Shandong Province. Tiri nyanzvi kutsvakurudza, kugadzira uyemunyu Optics uye Manyiminya zvinoriumba. Zvigadzirwa zvedu zvikuru zvinosanganisira Optical windows, prism, lens, beamsplitter, firita, wedge, blanks uye nezvimwewo.

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