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Early in 1999, bases on the market, Mizida was succeed in develop ping the minisize optical half ball cover, the aberrance less than 0.16%, ensuring the images not be distorted, the technology achieved he international level, many customers respond well and gave them high score. March 2000, Mizida's ball vidicon attended the England international exhibit of safety and defence. Under great effort, Mizid a developped the series ball cover and hugely improved the craftwork, made the thickness reduce to 1.2mm and reach the limit of infuse-mold technology.