A Manhole Cover

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Manhole covers are a vital component of urban and industrial sewerage systems that we deal with on a daily basis. These covers play a very important protective and functional role in these infrastructures by covering the entrance and exit openings of underground systems. If you have ever looked at the streets, you must have seen manholes that cover the street surface. These covers not only prevent people and objects from falling into the sewerage systems, but also help to make these systems easier to maintain.