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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.
This is a list of manhole cover markings found in New York City. Fiber-Optic Manhole Cover in NYC. Markings. Bell System; BECo = Brooklyn Edison Company;
The explosion, which occurred just before 6:00 p.m. local time, [1] near the peak of the evening rush hour, was caused by the failure of a Consolidated Edison 24-inch (0.61 m) underground steam pipe installed in 1924. [1] [11] The pipe was located at 41st Street and Lexington Avenue, near Grand Central Terminal.
Manhole covers in Helsinki, Finland. Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially ...
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A sanitary manhole under construction. A sanitary manhole (sewer manhole, [1] sanitary sewer manhole [2] or sewer maintenance hole [3]) is a manhole that is used as an access point for maintenance and inspection of an underground sanitary sewer system. Sanitary manholes are sometimes used as vents to prevent the buildup of pressurized sewage ...