Manhole cover Wikipedia. Krakw manhole cover note integral hinge. Ancient Roman sewer grate made out of lime sandstone, 1st century AD, excavated at Vindobona present day Vienna. Modern manhole cover in Rome with SPQR inscription. A manhole cover is a removable plate forming the lid over the opening of a manhole, to prevent anyone or anything from falling in, and to keep out unauthorized persons and material. Manhole covers date back at least to the era of ancient Rome, which had sewer grates made from stone.
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