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2. Operation Plumbbob - Wikipedia

   en.wikipedia.org/wiki/Operation_Plumbbob

   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.

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. Peaceful nuclear explosion - Wikipedia

   en.wikipedia.org/wiki/Peaceful_nuclear_explosion

   Although likely never achieving orbit due to aerodynamic drag, the first macroscopic object to obtain Earth orbital velocity was a "900kg manhole cover" propelled by the somewhat focused detonation of test shot Pascal-B in August 1957. The use of a subterranean shaft and nuclear device to propel an object to escape velocity has since been ...

5. Five times a manhole cover stopped F1 in its tracks

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6. Neenah Foundry - Wikipedia

   en.wikipedia.org/wiki/Neenah_Foundry

   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.

7. Manhole cover lifter can save the back of workers

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8. Sewer line, manhole cover replacements overdue in Fort Smith

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   Sewer line replacement work should have been completed in Fort Smith. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ...

9. File:Manhole cover pickholes.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Manhole_cover_pick...

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