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2. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_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. Fire pit - Wikipedia

   en.wikipedia.org/wiki/Fire_pit

   A fire pit or a fire hole can vary from a pit dug in the ground to an elaborate gas burning structure of stone, brick, and metal. The defining feature of fire pits is that they are designed to contain fire and prevent it from spreading. Certain contemporary fire pit styles include a fire bowl that can either be set in the ground or elevated on ...

4. Irori - Wikipedia

   en.wikipedia.org/wiki/Irori

   Irori. An irori (囲炉裏, 居炉裏) is a traditional Japanese sunken hearth fired with charcoal. Used for heating the home and for cooking food, it is essentially a square, stone-lined pit in the floor, equipped with an adjustable pothook – called a jizaikagi (自在鉤) and generally consisting of an iron rod within a bamboo tube – used for raising or lowering a suspended pot or kettle ...

5. Fireplace - Wikipedia

   en.wikipedia.org/wiki/Fireplace

   Modern open fireplace. An outdoor fireplace. A fireplace or hearth is a structure made of brick, stone or metal designed to contain a fire. Fireplaces are used for the relaxing ambiance they create and for heating a room. Modern fireplaces vary in heat efficiency, depending on the design. Historically, they were used for heating a dwelling ...

6. List of fire-retardant materials - Wikipedia

   en.wikipedia.org/wiki/List_of_fire-retardant...

   Fire-retardant materials should not be confused with fire-resistant materials. A fire resistant material is one which is designed to resist burning and withstand heat. An example of a fire-resistant material is one which is used in bunker gear worn by firefighters to protect them from the flames of a burning building.

7. Pitting corrosion - Wikipedia

   en.wikipedia.org/wiki/Pitting_corrosion

   Pitting corrosion, or pitting, is a form of extremely localized corrosion that leads to the random creation of small holes in metal. The driving power for pitting corrosion is the depassivation of a small area, which becomes anodic (oxidation reaction) while an unknown but potentially vast area becomes cathodic (reduction reaction), leading to ...