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2. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   A manhole pick or hook is typically used to lift them, though other tools can be used as well, including electromagnets. Painted manhole cover in Osaka , Japan Although the covers are too large to be easily collectible , their ubiquity and the many patterns and descriptions printed on them has led some people to collect pictures of covers from ...

3. Hook (hand tool) - Wikipedia

   en.wikipedia.org/wiki/Hook_(hand_tool)

   Before the age of containerization, freight was moved on and off ships with extensive manual labor, and the longshoreman's hook was the basic tool of the dockworker. The hook became an emblem of the longshoreman's profession in the same way that a hammer and anvil are associated with blacksmiths , or the pipe wrench with pipefitters ...

4. Manhole cover lifter can save the back of workers

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5. Thomas Crapper - Wikipedia

   en.wikipedia.org/wiki/Thomas_Crapper

   Manhole cover, inscribed "T Crapper & Co Sanitary Engineers Marlboro Works Chelsea London" As the first man to set up public showrooms for displaying sanitary ware, Crapper became known as an advocate of sanitary plumbing, popularising the notion of installation inside people's homes.

6. Manhole - Wikipedia

   en.wikipedia.org/wiki/Manhole

   Manhole covers in Helsinki, Finland. Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially ...

7. 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 ...