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2. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   A cab over semi-tractor. Tractor with an end-dump trailer. A FAW semi-trailer truck in China. A semi-trailer truck[1] (also known by a wide variety of other terms - see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel.

3. Centerlock wheel - Wikipedia

   en.wikipedia.org/wiki/Centerlock_wheel

   The centerlock wheel and hub system was first introduced by Rudge-Whitworth in the early 1900s, for use in automobile wire wheels. Initially called "QD" (for "quickly disconnectable") the basic mechanism for "knock-off" style centerlock hubs was patented by 1908. It was quickly adopted by auto manufacturers and racers.

4. Alloy wheel - Wikipedia

   en.wikipedia.org/wiki/Alloy_wheel

   Alloy wheel. In the automotive industry, alloy wheels are wheels that are made from an alloy of aluminium or magnesium. Alloys are mixtures of a metal and other elements. They generally provide greater strength over pure metals, which are usually much softer and more ductile. Alloys of aluminium or magnesium are typically lighter for the same ...

5. Magnesium wheels - Wikipedia

   en.wikipedia.org/wiki/Magnesium_wheels

   Magnesium is the lightest metallic structural material available. [1] It is 1.5 times less dense than aluminium, so magnesium wheels can be designed to be significantly lighter than aluminium alloy wheels, while exhibiting comparable strength. Many competitive racing wheels are made of magnesium alloy. [2]

6. Hubcap - Wikipedia

   en.wikipedia.org/wiki/Hubcap

   Various automobile hubcaps. A hubcap or hub cap is a decorative disk on an automobile wheel that covers at minimum the central portion of the wheel, called the hub. [1] An automobile hubcap is used to cover the wheel hub and the wheel fasteners to reduce the accumulation of dirt and moisture. It also has the function of decorating the car. [2]

7. Secret Service chief makes remarkable admission: We need a ...

   www.aol.com/news/secret-chief-makes-remarkable...

   "That to me is really unsettling," said Evy Poumpouras, a former Secret Service agent who protected multiple presidents, including Barack Obama and George W. Bush, during her 12 years with the ...