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Near the lake and river, the accidents of falling into the river often happen. This is the device we design to rescue the drowning man. Passerby who can not swim can use it to rescue the drowning man. The rescuer raises the top of the device and throws it to the drowning man. The life buoy in it will be filled with gas automatically in a short time when wet. After the drowning man gets it, rescuer pullbacks the rope linked the life buoy and helps the man out of the water.
Liu Yi Xu Wei Li Ke Meng Luhua