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A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.
Manhole. A manhole (utility hole, maintenance hole, [1] or sewer hole) is an opening to a confined space such as a shaft, utility vault, or large vessel. Manholes, typically protected by a manhole cover, are often used as an access point for an underground public utility, allowing inspection, maintenance, and system upgrades.
Cast metal storm drain grate with Neenah Foundry marking. Neenah Foundry is a manufacturing company in the north central United States, based in Neenah, Wisconsin.The company manufactures cast iron manhole covers, gratings, and similar items for municipal and construction applications.
The manhole cover business has turned over the years, from the sort of ornate covers that a business like Berry’s Foundry might have crafted to drabber covers that dot Sacramento’s streets today.
A series of sewer explosions rocked Louisville on Friday, Feb. 13, 1981, sending manhole covers flying and leaving gaping holes in multiple streets across the city.
The operation consisted of 29 explosions, of which only two did not produce any nuclear yield.Twenty-one laboratories and government agencies were involved. While most Operation Plumbbob tests contributed to the development of warheads for intercontinental and intermediate range missiles, they also tested air defense and anti-submarine warheads with smaller yields.