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2. George Walther Sr. - Wikipedia

   en.wikipedia.org/wiki/George_Walther_Sr.

   When semi-trailer trucks were developed, he designed improved versions of the fifth wheel and landing legs for semi-trailer trucks. Walther's engineering skills resulted in patents for many developments of truck wheels, brake drums, fifth wheels, and landing legs that have helped to expand the role of trucks in the transportation industry.

3. Semi-trailer - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer

   The combination of a semi-trailer and a tractor truck is called a semi-trailer truck (also known simply as a "semi-trailer", "tractor trailer", or "semi" in the United States). [1] A large proportion of a semi-trailer's weight is supported by a tractor unit, or a detachable front-axle assembly known as a dolly, or the tail of another trailer ...

4. Glossary of the American trucking industry - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_the_American...

   [1] [2] Another borrowed term is "landing gear" (from the aviation industry), which refers to the legs which support the front end of a semi-trailer when it is not connected to a semi-truck. Some nicknames are obvious wordplay, such as "portable parking lot", in reference to a truck that carries automobiles.

5. Trailer (vehicle) - Wikipedia

   en.wikipedia.org/wiki/Trailer_(vehicle)

   A semi-trailer is a trailer without a front axle. A large proportion of its weight is supported either by a road tractor or by a detachable front axle assembly known as a dolly. A semi-trailer is normally equipped with legs, called "landing gear", which can be lowered to support it when it is uncoupled.

6. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   Conventional style cab tractor A cab over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (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. Other terms There are a wide ...

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