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2. Operation Plumbbob - Wikipedia

   en.wikipedia.org/wiki/Operation_Plumbbob

   During the Pascal-B nuclear test of August 1957, [8] [9] a 900-kilogram (2,000 lb) iron lid was welded over the borehole to contain the nuclear blast, despite Brownlee predicting that it would not work. [8] When Pascal-B was detonated, the blast went straight up the test shaft, launching the cap into the atmosphere. The plate was never found. [10]

3. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   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.

4. ISO 15398 - Wikipedia

   en.wikipedia.org/wiki/ISO_15398

   The constraint "non-traffic areas" is also the crucial difference to the general European Standard for manhole covers EN124, which is only for vehicular access areas. Plastic-manhole covers according to ISO 15398 are designated for the commitment on control- and inspection chambers in pedestrian (class A 15) and light vehicular areas (max ...

5. Manhole - Wikipedia

   en.wikipedia.org/wiki/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

6. Sanitary manhole - Wikipedia

   en.wikipedia.org/wiki/Sanitary_manhole

   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 ...

7. Neenah Foundry - Wikipedia

   en.wikipedia.org/wiki/Neenah_Foundry

   Neenah Foundry; Company type: Private; Subsidiary: Industry: Foundry: Founded: 1872, 153 years ago: Headquarters: 2121 Brooks Avenue Neenah, Wisconsin, U.S.: Products: Cast iron infrastructure solutions (manhole frames and covers, inlet frames and grates, trench frames and grates, airport products, bridge drainage, tree grates, detectable warning products, downspout boots, access and hatch ...

8. File:1500 tonnes Pascal Q138-fr.svg - Wikipedia

   en.wikipedia.org/wiki/File:1500_tonnes_Pascal_Q...

   File:1500 tonnes Pascal Q138-fr.svg. Add languages. ... (SVG file, nominally 5,612 × 1,491 pixels, file size: 316 KB) This is a file from the Wikimedia Commons.

9. Talk:Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Talk:Manhole_cover

   The contents of the Manhole cover theft page were merged into Manhole cover on 28 June 2019. For the contribution history and old versions of the redirected page, please see its history ; for the discussion at that location, see its talk page .