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  2. Stair tread - Wikipedia

    en.wikipedia.org/wiki/Stair_tread

    A stair tread is the horizontal portion of a set of stairs on which a person walks. The tread can be composed of wood, metal, plastic, or other materials. In residential settings, treads can be covered in carpeting. Stair treads can come in non-slip varieties, particularly in commercial or industrial locations. [1]

  3. Stairs - Wikipedia

    en.wikipedia.org/wiki/Stairs

    Stairs are a structure designed to bridge a large vertical distance between lower and higher levels by dividing it into smaller vertical distances. This is achieved as a diagonal series of horizontal platforms called steps which enable passage to the other level by stepping from one to another step in turn.

  4. Stair nosing - Wikipedia

    en.wikipedia.org/wiki/Stair_nosing

    Many states have introduced laws and mandates that require new staircase construction to include an abrasive surface or stair tread to minimize the risk of stairway related incidents. One notable instance of this type of building regulation is 'Title 24, Part 2, Section 2-3326(b)' of the California Energy Commission 's "Building Energy ...

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  6. Escalator - Wikipedia

    en.wikipedia.org/wiki/Escalator

    Seeberger escalators featured flat treads and smooth risers; other escalator models have cleated treads and smooth risers. The steps are linked by a continuous metal chain that forms a closed loop. The front and back edges of the steps each have two wheels, the rear of which are set further apart and fit into the trailer-wheel track while the ...

  7. The main thing cellphone users can't live without, according ...

    www.aol.com/news/main-thing-cellphone-users-cant...

    The company treads a careful line when deciding what to offer in Light Phones. That's at odds with the many companies trying to evolve by incorporating AI into their operations.