What is a ONIS Line blind lifespan?
ONIS线盲的寿命是多少？
It depends on the environment mainly but we can say that some ONIS has been installed in 1979 and are still in operation. The reliability of ONIS line blinds has been proved after more than 40 years.
这主要取决于环境，但我们可以说，有些ONIS在1979年就已经安装了，现在仍在运行。ONIS快速操作盲板的可靠性在40多年后已经得到了证明。