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The Marvels of Manhole Covers

The Marvels of Manhole Covers  (A Guest Contribution) Stacked Manhole Covers at Briscover Factory  in Changsha China Sewer Covers are metal or concrete plates that cover the manholes. These days, they tend to be made from a combination of concrete and cast iron in order for them to be affordable yet sturdy. They are normally circular […]

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