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2. Handrail - Wikipedia

   en.wikipedia.org/wiki/Handrail

   A handrail is a rail that is designed to be grasped by the hand so as to provide safety or support. [1] In Britain , handrails are referred to as banisters . Handrails are commonly used while ascending or descending stairways and escalators in order to prevent injurious falls, and to provide bodily support in bathrooms or similar areas.

3. Stairs - Wikipedia

   en.wikipedia.org/wiki/Stairs

   Helical stairs typically have a handrail along the outer periphery only, and on the inner side may have just a central pole. A "squared helical" stair fills a square stairwell and expands the steps and railing to a square, resulting in unequal steps (wider and longer where they extend into a corner of the square).

4. Escalator - Wikipedia

   en.wikipedia.org/wiki/Escalator

   The track system is built into the truss to guide the step chain, which continuously pulls the steps from the bottom platform and back to the top in an endless loop. One track guides the front wheels of the steps (called the step-wheel track) and another guides the back wheels of the steps (called the trailer-wheel track).

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6. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

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7. Aluminum industry in the United States - Wikipedia

   en.wikipedia.org/wiki/Aluminum_industry_in_the...

   In 2014, by contrast, the US ranked sixth in primary aluminum production, and provided only 3.5% of world production. US production of primary aluminum peaked in 1980 at 4.64 million metric tons. Since then, US primary aluminum production has fallen by more than half, but secondary production has increased, making up much of the difference.