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2. Air caster - Wikipedia

   en.wikipedia.org/wiki/Air_caster

   Air casters require a smooth, non-porous surface in order to maintain lift and operate properly. Cracks and other surface defects can interrupt the proper flow of air, causing the air cushion to dissipate and thus lose its ability to lift. This limits their application to fields like manufacturing, where such surfaces are abundant.

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4. Hovercraft - Wikipedia

   en.wikipedia.org/wiki/Hovercraft

   A hovercraft (pl.: hovercraft [1]), also known as an air-cushion vehicle or ACV, [2] is an amphibious craft capable of travelling over land, water, mud, ice, and various other surfaces. Hovercraft use blowers to produce a large volume of air below the hull , or air cushion, that is slightly above atmospheric pressure .

5. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   A swivel caster. A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved. Casters are used in numerous applications, including shopping carts, office chairs, toy wagons, hospital beds, and material handling equipment. High capacity, heavy duty ...

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7. Office chair - Wikipedia

   en.wikipedia.org/wiki/Office_chair

   A swiveling chair with casters allowed employees to remain sitting and yet reach a number of locations within their work area, eliminating the time and energy expended in standing. The wooden saddle seat was designed to fit and support the body of a sitting employee, and the slatted back and armrests provided additional support to increase the ...

8. Coaster (rail service) - Wikipedia

   en.wikipedia.org/wiki/Coaster_(rail_service)

   Coaster (stylized in all caps) (reporting marks NCTC, SDNX) is a commuter rail service in the central and northern coastal regions of San Diego County, California, United States, operated by the North County Transit District (NCTD).

9. Timeline of United States inventions (before 1890) - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_United_States...

   Benjamin Franklin invented wooden swim fins in 1717. [10] His original design consisted of 10-inch-long (250 mm) and 6-inch-wide (150 mm) palettes. Contrary to today's version of rubberized swim fins worn on the feet, Franklin's swim fins were originally intended for use on a person's hands.