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On stormy days, the sight of passers-by would be obstructed by the deep seeper and the loss of manhole covers could endanger the lives of passers-by. LAND NAVIGATION is a manhole cover warning lamp, which used for warning passers-by of the danger from loss of manhole covers.
LAND NAVIGATION is supplied by primary cell when it works. Once the manhole cover is away from its original position, rainwater will rush into the filtrate tank, the primary cell will go to work, and as a result, the lamp will began to light.