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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. Independent Iron Works - Wikipedia

   en.wikipedia.org/wiki/Independent_Iron_Works

   After a sale in 1958, the major facilities came under the ownership of Phoenix Iron Works. The latter firm's name can be found on many roadway manhole covers in California. References

5. Manhole covers disappearing, police looking for 4 large turtles!

   www.aol.com/2008/06/30/manhole-covers...

   Recently a disturbing trend has shown up in cities across the U.S. where manhole covers are. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290 ...

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

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7. Manhole cover lifter can save the back of workers

   www.aol.com/manhole-cover-lifter-save-back...

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8. 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 ...

9. Answer Woman: Who makes the manhole covers with river ...

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   A reader asks for details about the Metropolitan Sewerage District's designed manhole covers. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways ...