Also in 1956 they developed a new flexible gasket system for their central focus binoculars which substantially improved the sealing of the interior optics against dust, dew, light rain.

• 还是在1956年时，西蔡就开发了一种供中调双望使用的新型柔性密封垫圈系统，从而在本质上提高了双望内部光学部件防灰、防水和防雨性能。