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The Chinese Optical Society (COS) (No. 2455) Company  |  News  |  Events  |  Contact Us Founded in 1979, The Chinese Optical Society (COS) was a nongovernmental organization of scientific and technological workers in the field of optics and optical engineering. COS was organized to advance the technology development of optics and promote the communication of scientists, engineers, educators and students. Contact Us Website: http://cncos.org/ Telephone: +86-10-68598467 Address: 54 Sanlihe Road, Xicheng District, Beijing, China