Shan dong yuying optical instruments co.ltd,from1968 since its eastablishment in the fresnel lens production,focusing on optical design, various types fresnel lens mold manufacturing and process research, have developed a solar concentrator, rear projection screen, LED light,PIR lens,projectors and other uses fresnel lens products,after years of concentrated research, optical design and production experience, so the product variety, good quality, is the leading domestic level,products are sold liv...
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