成在人线无码aⅴ免费视频-国产片a国产片免费看视频-国产精品白丝久久av网站-成人国产片女人爽到高潮-国产精品久久久久这里只有精品

Product name：Safety performance of double safety air spring

S type dual gas spring with safety: S type double tube gas spring with safety is a steel casing in conventional compression gas spring stroke position, play a supporting role in the two gas spring failure, gas spring damaged the warning, to facilitate the timely replacement. The utility model is mainly used for the support of the box cover of the mechanical equipment, the support of the display cabinet and the precision instruments, and the utility model is widely used on the large and complex equipment.