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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.
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.
Whitechapel Fatberg memorial manhole cover. September 2017: A 250-metre-long (820 ft) fatberg weighing over 130 tonnes (140 short tons) was found under Whitechapel, London. [30] Even working seven days a week at a cost of £1 million per month, officials estimated it would take two months to destroy it.
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 ...
These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially where cover theft is of concern). Because of legislation restricting acceptable manual handling weights, Europe has seen a move toward lighter-weight composite manhole cover materials ...
Packaged metering manhole factories integrate a primary device (typically a flume [1] or weir [2]) into a fiberglass manhole. The result is a lightweight, single-piece (generally), corrosion resistant structure from which an operator can measure piped flows, take composite samples, and perform water quality parameter monitoring.
3. Keebler Fudge Magic Middles. Neither the chocolate fudge cream inside a shortbread cookie nor versions with peanut butter or chocolate chip crusts survived.
English: Whitechapel, Fatberg memorial manhole cover. Outside Whitechapel Station by the crossing, where the pedestrianised Court Street meets Whitechapel Road. Discovered in 2017, it weighed 130 tonne. A fragment went on show at Museum of London.
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