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Usually manhole covers are easy to be washed away when the storm or flood, imperceptible and passing are in danger of falling sewers.This safety manhole covers to saving the life of pedestrians. When manhole covers have been washed away, will trigger warnings and protection system, Yin wellhead warning red light will automatically open play a warning role, and it will pop up from the pit edge life buoy, prevent fall sewers.Lead to a lot of people die each year according to the statistics of such accidents or in danger.
China Academy Of Art