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Shandong Yanggu Constant Crystal Optics, Inc na faavaeina ia Aperila 2006, o loʻo i totonu o le sone o le atinaʻeina o le tamaoaiga o Xiangguang, Yanggu County, Shandong Province.Matou te faʻapitoa i suʻesuʻega, gaosiga masalingoptics ma vaega opitika.O a matou oloa autu e aofia ai le faamalama opitika, prism, tioata, beamsplitter, faamama, tina, avanoa ma isi. Matou te tuuina atu foi auaunaga masani e tusa ai ma talosaga a tagata faatau

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