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2. 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.

3. 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.

4. Sanitary manhole - Wikipedia

   en.wikipedia.org/wiki/Sanitary_manhole

   The cover section is the top most section of sanitary manholes. It consists of a frame and a manhole cover. [16] The covers are designed to withstand the loads of the traffic on top of the manholes. Some are suitable for vehicular traffic, and some are for foot traffic only. [7]

5. Manhole cover explodes in downtown Detroit, leaving one ...

   www.aol.com/manhole-cover-explodes-downtown...

   A manhole cover in downtown Detroit, at the corner of Congress and Bates, launched off the ground Friday afternoon, sending one to the hospital. ... Another can be heard estimating the manhole ...

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

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7. File:Manhole cover, Taylor Township (City of Taylor).jpg

   en.wikipedia.org/wiki/File:Manhole_cover,_Taylor...

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

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9. Man tumbles 20 feet down manhole and gets stuck for an hour ...

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