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The Hoover Company is a home appliance company founded in Ohio, United States, in 1908.It also established a major base in the United Kingdom, where it dominated the electric vacuum cleaner industry during most of the 20th century, to the point where the Hoover brand name became synonymous with vacuum cleaners and vacuuming in the United Kingdom and Ireland.
A vacuum cleaner, also known simply as a vacuum, is a device that uses suction, and often agitation, in order to remove dirt and other debris from carpets, hard floors, and other surfaces. The dirt is collected into a dust bag or a plastic bin.
Engineers check an aircraft model before a test run in the Supersonic Wind Tunnel at Lewis Flight Propulsion Laboratory. Schlieren photography is often used to capture images of gas flow and shock waves in supersonic wind tunnels. Here, Mach 4 flow over a pitot probe is observed by schlieren optics in the Penn State Supersonic Wind Tunnel. The ...
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