国产免费AV片在线观看下载,色综合视频一区二区三区44,国产亚洲精品线观看动态图,国产精品亚亚洲欧关中字幕,欧美变态另类牲交,男女裸交高潮无遮挡免费观看,99久在线国内在线播放免费观看,大地资源二在线观看免费高清,午夜AV无码福利免费看网站,欧美在线亚洲

Since the cooperation between Suzhou Xinguo Optical Instrument Component Factory (before transformation) and Beijing Optical Instrument Factory in 1984, we have been committed to providing various optical components for national surveying and mapping instrument manufacturers. We are familiar with the optical systems and component composition, processing technology, and testing standards of electronic theodolites, leveling instruments, verticals, total stations, and other models.

The products include objective lenses, objective lens groups, eyepieces, eyepiece lens groups, focusing lenses, field lenses, right angle prisms, oblique prisms, Abbe prisms, ridge prisms, beam splitting prisms, window plates, reflectors, protective films, filters, dividers, and more. The stable product quality and actively cooperating service have received unanimous praise from customers.

Users include Japanese companies such as Nikon, Pentax, Hexagon, Leica, etc.